Mr. F. Galton's Experiments in Pangenesis. 



377 



If the successive injections be numerous and small, so as to be 

 equivalent to a continuous flow, then, after w of alien blood has 



passed in, the formula becomes V.e V. 



A comparison of the numerical results from these two formulae 

 shows that no sensible diff'erence is made if (within practicable limits) 

 few and large, or many and small, injections are made, the total 

 quantity injected being the same. 



In cross-circulation the general formula is this : — If V be the 

 volume of blood in the other rabbit, after w of alien blood has passed 

 through either canula, the quantity of blood a remaining in the Silver- 

 grey exceeds* 



^,{v + Ve-(T+fh}. 



This becomes — \ \+e V [ whenV = V'; also, when V is infinite, 



it gives the formula already meutioned for injection by a continuous 

 flow of purely alien blood. 



Table I. 



(Contents of circulation of Silver-grey Rabbit=100.) 



I now give a list (Table II.) of the rabbits to which, or to whose 

 * I am indebted to Mr. George Darwin for this formula. 



