1871.] Mr. F. Galton's Experiments in Pangenesis. 405 



I. Experiments of cross-circulation on one buck and two does, pure silver- 

 greys, of a breed obtained from Mr. E. Royds, of Greenhill, Rochdale, the 

 same breed as that on which all my u and w experiments had been made. 



Oct. 19, 1870.— Silver-grey buck, 0, out of doe A (u) by M (u), and 

 therefore own brother to the white-footed young one, a small rabbit, just 

 six months old. His blood-mate was a 



Yellow buck, lop-eared, white throat, probably one- 

 fifth heavier than the silver-grey. I avoided unnecessary weighing, because 

 it frightens the animals, and tends to interfere with the final success. At 

 12 h 30 m I made cross-circulation ; flow was perfect; 12 h 35 m , continued 

 perfect; 12 h 40 m , perfect, but yellow to silver-grey perhaps the stronger; 

 12 h 44 m , ditto; 12 h 50 m , perfect both ways ; 12 h 55 m , ditto ; l h , ditto; 

 l h 5 m , ditto ; l h 71 m , ditto. I then stopped and tied up. I tested the 

 flow with a small and delicate but very simple pulse-meter on all these 

 occasions, not liking to interfere overmuch with my fingers. I, however, 

 used them at the commencement, at 12 h 50 m , and at l h 5 m . 



Oct. 20, 1870. — Silver-grey doe, B (u), a fine large animal ; her blood- 

 mate was a Common large grey lop-eared doe, about one-tenth 

 heavier than the silver-grey. 



l h , cross- circulation established, apparently perfect; I mean the throb- 

 bing of the canula and artery were obvious ; l h 6 m , felt and found the flow 

 quite good; l h 12 m , common to silver-grey quite good, vice versa poor; 

 l h 15 m , ditto; I disconnected and cleaned and removed clots and recon- 

 nected. This I repeated several times ; there was still much trouble in 

 maintaining a proper flow from silver to common grey, but common to 

 silver was always good. The operation continued till l h 40 m ; then I dis- 

 connected ; and as the silver-grey had received too much, I let her bleed 

 to 4 drachms. 



Oct. 27, 1870. — Silver-grey doe, H, moderate size; her blood-mate 

 was a Common large grey doe, certainly more than a tenth 



heavier than the silver-grey. There was some trouble with her, as the 

 carotid was abnormal, and three offshoots from it had to be tied before the 

 canula could be inserted. 



12 h 48 ra , cross -circulation established, perfect pulse, but silver to common 

 the fullest; 12 h 53 m , perfect; l h , silver to common perfect, vice versa 

 rather poor ; l h 2 m , ditto ; l h 7 m , common to silver stopped ; I disconnected 

 and cleaned and reconnected, and by l h 12 m had reestablished perfect cross- 

 circulation ; at l h 30 m I had stopped silver to common and made common 

 to silver better ; got five minutes good flow, then repeated cleanings and 

 got three minutes more. My estimate at the close of the operation was 

 that the silver-grey gave blood freely for thirty-five minutes, and received 

 it freely for about the same time. 



II. Experiments of cross-circulation on two bucks and two does of a silver- 

 grey breed, reputed pure, and looking well-bred animals, but liable to 



