ANIMAL MECHANICS. 



149 



Poiseuille (p. 301) gives the following as the mean 

 the pressures found in the horse and dog : — 



of all 



146.68 mm. 

 147.00 „ 



154-33 » 

 182.05 „ 



Dog. 



147 -3 6 

 I4I-45 

 157-39 

 145 -75 

 166. 60 

 179.04 

 141.40 

 171.14 



Spengler* repeated the experiments of Poiseuille, and ob- 

 ined, among others, the following results from the arteries 

 of the horse. The mean maximum pressures during expira- 

 tion were, 



1 . First horse, 



2. Second horse, 



3. Third horse, . 



4. Fourth horse, . 



5. Fifth horse, 



6. Sixth horse, . 



Mean maximum, 



229.31 mm. of mercury. 

 200.67 

 171.34 



1 70.00 

 220 00 

 230.00 



2Q3-55 mm. of mercury. 



This result agrees well with those of Hales and Poiseuille. 



; ' Archiv fur Anatomie," &c, von Miiller (1844), p. 49. 



