t 298 ) 



'^' dp dT 



If we take the product of — — r, find — — we find the value of 



p dl la.x 



1 dp T dp dT 



for tlie beginning of the pUiituoint line. As both — 777, iiiid 7— p 



p dx p dl Ida; 



are negative for the mixture of carbonic acid and oxygen, the value of 



(I'll) 



— ) IS positive. 



Anatomy. — "Bolk's centra in the cerehellum of the mammalia". 

 By D. J. HuLSHOFF Pol (from the laboratory for Psychiatry 

 and Neurology at Amsterdam). (Communicated by Prof. 

 C. Winkler). 



In his well-known researches about the cerebella of mammalia ^), 

 BoLK concludes: that "the Lobus anterior cerebelli does contain the 

 centre of coordination for the muscle-groups of the head, the Lobus 

 simplex the centrum of coordination for those of the neck; the non- 

 symmetrical centre of coordination for both left and right extremity 

 is situated in the Lobus medianus posterior, whilst each of the 

 Lobuli ansiformes is the seat of one of the symmetrical centra, 

 respectively for both right, and for both left extremities." ') 



Within the same line of research, Van Rijnberk ') at Luciani's 

 laboratory in Roma, experimenting on two dogs, extirpated a portion 

 of the cerebellum, with the aim of taking away the right part of the 

 Lobus simplex. 



The secondary symptoms, which were observed during the first 

 days after the operation, having passed away, the animal experi- 

 mented upon continued shaking its head, as if it meant to say "no". 



This symptom resembled very much a trouble in the coordination, 

 and such being indeed the case, it would have confirmed the hypo- 

 thesis of BoLK. Therefore it was important to determine with as 

 much exactness as possible, which portion of the cerebellum had 

 been removed. 



To this purpose the preparation, fixed in formol, was offered 



1) Prof. Dr. L. Bolk. Das Cerebellum der Saugetiere. Petrus Camper, Vol III, 

 part. I. Amsterdam. 



2) Prof. Dr. L. Bolk. Over de physiologische beteekenis van liet cerebellum. De 

 Erven Bohn, Haarlem. 1903. 



8) G. A. VAN Rijnberk. Tentative di localisaziöne funzionali nel cerveletto. Archivio 

 di fisiolosia. Vol. I. Fasc. V. 



