C 98 1 



VI. Account of a Peculiarity in the Distribution of the Arteries 

 sent to the Limbs of slow-moving Animals ; together with some 

 other similar Facts. In a Letter from Mr. Anthony Carlisle, 

 Surgeon, to John Symmons, Esq. F. R. S. 



Read Jan. 9, 1800. 



DEAR SIR, 



1 he Maucauco you have been so obliging as to give me for 

 the purpose of dissection, has proved a subject of considerable 

 interest. This animal, the Lemur tardigradus of Linn^us, was 

 injected, with a view to exhibit the course of the arteries ; and 

 they present a very unusual deviation from the ordinary arrange- 

 ment of this class of blood-vessels in animals generally. Before 

 I had leisure to inquire further into this peculiarity, I presented 

 a drawing of the appearances to my friend Dr. Shaw, of the 

 British Museum, for the purpose of being made public in his 

 work of natural history, now in the press. Since that time, I 

 have, through Dr. Shaw's assistance, been enabled to investi- 

 gate this subject somewhat farther; and, if you consider the 

 following account in any degree worthy the attention of the 

 Royal Society, I shall receive an additional honour by its pro- 

 ceeding through your hands. 



The Lemur tardigradus, in its injected state, accompanies this 

 paper ; and, for the kind of preparation, the vessels are filled 

 with more than ordinary success. The arteries alone are injected ; 

 and the peculiarity of their arrangement is to be observed in 

 the axillary arteries, and in the iliacs. These vessels, at their 

 entrance into the upper and lower limbs, are suddenly divided 



