260 



appears to occur in April or May, and its lowest about November. 

 These results are confirmed by the comparative observations made 

 at Geneva and the Great St Bernard, where the difference of ele- 

 vation is no less than 6800 feet. The reason of this the author 

 conceives to be the following. When we compare the curves of 

 annual temperature at the lower and higher stations, we find the 

 following differences. (1.) The curve at the higher station is in 

 every point loiver than that at the other station. (2.) It isjiafter ; 

 the annual range being less. This causes the difference of maxima 

 to exceed the difference of minima. (3.) The curve at the higher 

 station is shifted, so that its maximum and minimum occur later. 

 This causes the difference between the two curves to attain a maxi- 

 mum during their rise, and a minimum during their decline, which 

 corresponds to the fact, and is easily explained on known meteoro- 

 logical principles. 



Monday, \bth April. 

 Lord GREENOCK in the Chaif. 



The following Donations were presented : — 



Bulletin de la Societe de Geographie. Deuxieme serie. Tome x. 



— Bi/ the Society. 

 Comptes Rendus Hebdomadaires des Seances de TAcadcmie des 



Sciences, 1839. 1"' Semestre. Nos. 10, 11, 12 — By the Aca- 

 demy. 

 Report on the Geology of Cornwall, Devon, and West Somerset. 



By Henry T. De La Beche, F. R. S., &c Presented by the 



Lords of the Treasury. 

 Flora Batava, No. 117 — By the King of Holland. 

 Journal of the Statistical Society of London, No. 12, for April. — 



By the Society. 

 Herniarnm Corporis Humani Tabnlje Anatomico-Pathologicae ac 



Cliirurgicse quas edidere Professores Imperatoria; Medico- 



Cliirurgicffl Academise PetropolitanHe Christianus Salomon 



Petrus Savenko. 

 Elise Buialsky Tabulae Anatomico-Chirurgicse, Operationes Ligan- 



darum Arteriarum Majorum exponentcs. 



By the Imperial MedicO'Chirurgical Academy 

 of St Peter shurgh. 

 The following communications were read : — 



