Le lettere di Eugenio Beltrami nella corrispondenza di Ernesto Cesàro

Summary We publish seventeen letters by Eugenio Beltrami to Ernesto Cesàro, which are dated from 1883 until 1900. They are about academic and scientific questions. Beltrami communicated many of Cesàro's memoirs to the Accademia dei Lincei or the Istituto Lombarde di Scienze e Lettere, and often gave him suggestions for his books and papers in these letters. When Cesàro looked for a professorship in the United States, Beltrami gave him information.In some letters Beltrami discussed questions on geometry and mathematical physics. In particular, the third letter (dated December 1st, 1888) is devoted to the mechanical interpretation of Maxwell's equations. Here, Beltrami shows a new proof of the conditions when six given functions are the components of an elastic deformation.

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Memoria presentata da U. Bottazzini     

Su un criterio di valutazione dell'attività di un farmaco antitubercolare nella cavia infettata con carica massiva

Summary It is reported that the data of index of tuberculous process obtained after 70 days of massive infection (with 1 mg bacilli) and immediately treated with antitubercular drug, are similar to the data observed in the guinea pig infected with a low dosage of bacilli and not treated with any antitubercular drug. The authors therefore suggest the use of this comparision for a test of the antitubercular activity of a drug.     

Studio farmacologico di un nuovo coleretico derivato dall'acidoα-cicloesil butirrico

Summary -(1-Hydroxy-4-phenyl-cyclohexyl)butyric acid (M. G. 4833) and-(1-hydroxy-3-phenyl-cyclohexyl) butyric acid (M. G. 4834) have been synthesized; both substances were endowed with choleretic activity.M. G. 4833 is the more active; it acts at lower doses and for a longer time than sodium dehydrocholate on rats, rabbits and dogs submitted to temporary fistulization of the bile-duct.     

Il Problema delle Tangenti nella „Géométrie“ di Descartes

Presentato da A. P. Youschkewitch     

Giochi,Scommesse sulla Vita,Tabelle di Mortalità: Nascita del Calcolo Probabilistico,Statistica e Teoria delle Popolazioni

Presentata da C. Truesdell     

La posizione occupata dalla fosforilcolina,citidindifosfatocolina, α-glicerilfosforilcolina e da altri corpi analoghi nel ciclo metabolico di alcuni fosfatidi encefalici

Summary The rate of turnover of individual P-compounds, related to the metabolic cycle of some phosphatides, was followedin vivo in the brain of rats a few days old after³²P administration. The phosphorylcholine is the precursor of the cytidinediphosphatecholine; this in turn may be the precursor of lecithin. Thel--glyceryl-phosphorylcholine represents the degredation product of lecithin. The specific activity curves of the phosphorylethanolamine and phosphorylse rine are similar to that of the phosphorylcholine; likewise thel--glycerylphos-phorylethanolamine is similar to the activity curve of thel--glycerylphosphorylcholine.     

Identificazione cromatografica della fosforilcolina,-etanolamina, -serina,dellaα-glicerilfosforil-colina,-etanolamina e della citidindifosfatocolina nell'encefalo di ratti in accrescimento

Summary A method is described whereby the phosphoryl-choline,-ethanolamine, -serine, thel--glycerylphosphoryl-choline,-ethanolamine, the phosphatidyl-choline,-ethanolamine, -serine and also the cytidinediphosphatecholine may be separated in the brain of a rat a few days old (340–610 mg).