Prerequisites for a Consistent Framework of Quantum Gravity

An ontological approach to the analysis of conceptual frameworks of physical theories is introduced and then applied to the case of quantum gravity. The tension between the theoretical constraints posed, respectively, by general relativity and quantum field theory, is analysed. A possible solution to the difficulties created by the tension, based on the notion of ontological synthesis, is suggested.     

Quantum state holism: a case for holistic causation

I propose to interpret quantum state holism as a view concerning possibilities: the degree of possibility of a compound's outcome is not determined by the degrees of possibility of the components' outcomes. To analyze this proposal I sketch the modal framework of branching space-times with probabilities understood as weights of possibility. These probabilities serve to define holistic events. A holistic event produces its outcomes subluminally; yet the degree of possibility of its outcome is not determined by the degrees of possibility imposed by the event's components.     

The flow of a solution into a tube filled with solvent: Mathematical derivations

Résumé On offre un ensemble d'équations qui s'appliquent à l'écoulement laminaire de deux solutions A et B, de même viscosité, lorsqu'on introduit B dans un tube préalablement rempli de solution A.     

Social imperialism and state support for agricultural research in Edwardian Britain

The origin, character, and reception of the Development Act of 1909 are described. Extant evaluations of its historical significance are presented and criticized. It is claimed that the significance of the Act for the promotion of scientific research in agriculture, horticulture, and forestry has been largely overlooked. The way in which the Commissioners of the Act interpreted their brief by establishing scholarships, new research institutes, and developing existing institutes is described.     

Multi-model ensembles in climate science: Mathematical structures and expert judgements

Projections of future climate change cannot rely on a single model. It has become common to rely on multiple simulations generated by Multi-Model Ensembles (MMEs), especially to quantify the uncertainty about what would constitute an adequate model structure. But, as Parker points out (2018), one of the remaining philosophically interesting questions is: “How can ensemble studies be designed so that they probe uncertainty in desired ways?” This paper offers two interpretations of what General Circulation Models (GCMs) are and how MMEs made of GCMs should be designed. In the first interpretation, models are combinations of modules and parameterisations; an MME is obtained by “plugging and playing” with interchangeable modules and parameterisations. In the second interpretation, models are aggregations of expert judgements that result from a history of epistemic decisions made by scientists about the choice of representations; an MME is a sampling of expert judgements from modelling teams. We argue that, while the two interpretations involve distinct domains from philosophy of science and social epistemology, they both could be used in a complementary manner in order to explore ways of designing better MMEs.     

Mathematical formalisms in scientific practice: From denotation to model-based representation

The present paper argues that ‘mature mathematical formalisms’ play a central role in achieving representation via scientific models. A close discussion of two contemporary accounts of how mathematical models apply—the DDI account (according to which representation depends on the successful interplay of denotation, demonstration and interpretation) and the ‘matching model’ account—reveals shortcomings of each, which, it is argued, suggests that scientific representation may be ineliminably heterogeneous in character. In order to achieve a degree of unification that is compatible with successful representation, scientists often rely on the existence of a ‘mature mathematical formalism’, where the latter refers to a—mathematically formulated and physically interpreted—notational system of locally applicable rules that derive from (but need not be reducible to) fundamental theory. As mathematical formalisms undergo a process of elaboration, enrichment, and entrenchment, they come to embody theoretical, ontological, and methodological commitments and assumptions. Since these are enshrined in the formalism itself, they are no longer readily obvious to either the novice or the proficient user. At the same time as formalisms constrain what may be represented, they also function as inferential and interpretative resources.     

A Framework for Defining the Generality of Diophantos' Methods in ``Arithmetica'

Diophantos' solutions to the problems of Arithmetica have been the object of extensive reading and interpretation in modern times, especially from the point of view of identifying ``hidden steps' or ``general methods'. In this paper, after examining the relevance of various interpretations given for the famous problem II 8 in the context of modern algebra or geometry, we focus on a close reading of the ancient text of some problems of Arithmetica in order to investigate Diophantos' solving practices. This inquiry reveals certain pointers, which enable us to create a framework for defining the generality of Diophantos' methods. An erratum to this article can be found at     

Blood clots: the nineteenth-century debate over the substance and means of transfusion in Britain

Historians have devoted little attention to blood transfusion in the nineteenth century. In part, this neglect reflects the presentist assumption that, before Karl Landsteiner's discovery of blood types, this practice would have failed too often to gain currency. Yet, transfusion was in fact the subject of much debate, and was actively practised, primarily by obstetricians on haemorrhaging women. Examining this practice through the conceptual lens of 'blood clots', both as noun and as observation, I follow transfusors' assumptions about the nature of the blood and the problem of its coagulation. Tracing the medicalization of ideas about blood by the century's end, I map this shift onto changing notions about why transfusion was performed, what substance was best employed, and what instrument best fitted that substance's movement into the circulation. In this way, 'Blood Clots' reconstructs the discourse surrounding transfusion, extending that discourse to material culture in order to illuminate the rationale that guided transfusion's practice in nineteenth-century Britain.     

'Science Fights Death': David Stark Murray,Science, and Socialism in Interwar Britain

The pathologist David Stark Murray (1900-77) was a founder and leading member of the Socialist Medical Association (SMA), an organization affiliated to the Labour Party and instrumental in shaping its health policy in the period up to 1945. Murray played a prominent role in the SMA as a member of its Executive Committee and as Editor of its journal MedicineToday and Tomorrow. This article examines Murray's popular writings about science during the interwar period, focusing on his emphasis on the relationship between, on the one hand, scientific knowledge and scientific method; and, on the other, a socialized health service and a socialist society.     

An ‘experimental’ instrument: testing the torsion balance in Britain,Canada and Australia

The torsion balance, an instrument that was first developed to demonstrate the high precision of physical science in the laboratory became a different sort of demonstration instrument in its brief vogue in the 1920s. This article considers intersecting stories of acquiring and testing the torsion balance as a field instrument in Canada, Britain and Australia. It examines the purchasing trip and fieldwork of A. H. Miller of the Dominion Observatory in 1928–1931, testing conducted by the British Geological Survey in 1926–1930, and finally the Imperial Geophysical Experimental Survey of 1928–1930 in Australia. These different stories produce a kind of collective biography, illustrating well the variety of material and textual records that accrete around instruments, especially expensive ones. But the trials and travels of the torsion balance also point to large themes. By comparing the different ways an instrument becomes valuable, and to whom, these micro-histories reveal significant features of the developing identity of geophysics. They also show the interaction of different forms of scientific internationalism in the inter-war period.     

Lime in the Early Bleaching Industry of Britain 1633-1828: Its Prohibition and Repeal

This essay describes the background and possible reasons for legal intervention in the use of lime in the early bleaching industry and draws on the Statutes at Large and other Acts of Parliament as primary sources. The developing chemical knowledge that may have contributed to the later Acts of repeal is also considered in some detail. The earliest noted prohibition was in 1633 and the years 1823, 1825, and 1828 were important repeal dates. No related legislation later than 1828 has been found. During the period from 1633 to 1828 there were many renewals and modifications to existing laws concerning linen and hempen manufacture; several of these contained subsections regarding bleaching. The considerable number of such Acts may account for the apparent confusion shown by earlier authors on this subject. Furthermore, the various Acts passed by the Irish House of Commons over its lifetime from 1400 to 1800, with its many interruptions, were published in a limited number of editions and are consequently held by few libraries. Ireland instituted its own laws and it was only after the Act of Union in 1800 that matters were dealt with by Westminster. Indeed, earlier historians have not always appreciated that, at certain periods of the history of the United Kingdom, Ireland and Scotland (as well as England) had their own separate parliaments.