62 Messrs. Buckmaster and Gardner. Composition of [Jan. 9, 



that parts of the lung, for example the apices, are imperfectly ventilated, and 

 also, since the circulation time in the lung is only about five or six seconds, 

 that complete equilibrium is not attained between the blood and alveolar air. 



In the case of venous blood, we have only made one experiment in a cat 

 breathing air. 



Venous Blood. 



j Weight of cat. 



Hirudin. Volume of blood. 



Total gas. 



COo. 



o 2 . 



m 



! 1 



3-7 + 2L-5 



56 -66 



44 -24 



11 -31 



1-12 



We have, however, made a number of determinations of the gases of 

 human venous blood. This was withdrawn from the median basilic vein by 

 displacement of mercury in the manner described in detail in a former 

 paper.* As we performed the experiments on ourselves, the blood was not 

 hirudinised and was taken without an anaesthetic. The results are given in 

 Table III. 



Table III. — Venous Blood (Human). Air. 



No. of 

 ment. 



Source Sample 



j. a. a. 



Gr. A. B. 



J. A. G-. 

 G-. A. B. 

 J. A. Gr. 



21 -37 



18-7 



21 -5 

 21 -5 

 21-4 

 21 -45 

 21 -1 



G-as per 100 grm. blood. 



Total. ! C0 2 . ' O,. 



55-59 44-05 | 10-27 

 61-46 50-95 



54-58 I 49-07 



59-94 53-33 



55 -04 47 -10 



53 -39 | 41 -14 



63-22 52-47 



16-5 57-89 48-44 7 "79 

 19-0 58-56 46-31 10-21 

 10-3 57-17 50-73 I 5-37 



53-63 j 2-63 



No bandage round forearm. 



Early form of new pump. 

 No bandage on forearm. Early 



form of new pomp. 



Taken without any straining of 

 muscles, but after some 

 exercise. Early form of new j 

 pump. 



Early form of new pump. 



Bandage on forearm, not un- j 

 comfortably tight. New [ 

 pump ; vacuum with liquid j 



Bandage on forearm, a little i 

 tighter. New pump ; vacuum 

 with liquid air. 



* ' Journ. Physiol.,' 1910, vol. 40, p. 373. 



