408 



Mr. F. Galtou's Experiments in Pangenesis. [Mar. 30, 



show russet marks. They were procured of Mr. Vipan, of March, Cam- 

 bridgeshire, and are of the same breed as those on which Mr. Bartlett 

 made his well-known experiments about the production of Himalayas 

 (Proc. Zool. Soc. 1861). They are liable to throw "Sandy Himalayas," 

 as I found myself, as Mr. Bartlett also found, and as Mr. Yipan informs 

 me is the case. I distinguish this breed by asterisks .(*). 



Oct. 6, 1870. — Silver-grey buck, P*, moderate size; his blood-mate was a 

 Common grey buck, with some russet on his back and 

 white on his belly ; he was the larger of the two animals. 



12 h 50 m , cross-circulation established, perfect ; 12 h 55 m , ditto, but silver 

 to common, I think, a trifle the stronger ; 12 h 59 m , ditto ; l h 5 m , common 

 to silver very faint. I stopped them and cleaned out twice and succes- 

 sively ; l h 15 m , good, but common to silver was the least good ; l h 25 m , dis- 

 connected. My estimate was that there had been an equivalent to fully 

 twenty-five minutes, and perhaps thirty minutes, of capital flow both ways. 



Oct. 7, 1870. — Silver-grey buck, Q*, moderate size; his blood-mate 

 was a Yellow buck, white belly, large. 



ll h 40 m , cross- circulation established; ll h 45 m , quite good; ll h 50 m , 

 good but not perfect; ll h 55 m good; 12 h both stopped. Then I made 

 several disconnexions and cleanings, and obtained short periods of success ; 

 at 12 h 35 m I finally stopped. My estimate was thirty minutes' good run- 

 ning : the silver-grey received more than his share ; there was a slip in 

 the operation, and five drachms of blood were lost between the rabbits ; so 

 I did not care to let the silver-grey bleed more. 



Oct. 6, 1870. — Silver-grey doe, I *, moderate size ; her blood-mate was a 



Common grey doe, large. 

 3 h 40 m , cross- circulation was established ; 3 h 44 m , excellent ; 3 h 50 m , ex- 

 cellent ; 3 h 55 m , excellent ; shortly after, something was twisted or other- 

 wise went wrong, and both stopped. I had a good deal of trouble and 

 but little further success. Ten drachms of blood was lost between the 

 rabbits (partly by leakage of the canulse). 



Oct. 7, 1871. — Silver-grey doe, J*, moderate size ; her blood-mate was a 

 Yellow doe, dark about mouth, and also of moderate 

 size. I afterwards became convinced she was simply a sandy Himalaya. 



At 2 h 5 m established cross-circulation; 2 h 13 m , quite good; 2 h 20 m , ex- 

 cellent ; 2 h 25 m , excellent ; 2 h 30 m , ditto ; 2 h 35 m , ditto ; 2 h 40 m , ditto, then 

 disconnected. An accident occurred at the end, by which the silver-grey 

 lost four drachms of blood. 



APPENDIX II. 



Description of the method of performing the operations. 



It is essential to a fair chance of success that the operator should have 

 a large and thriving stock of full-grown rabbits. They cannot be pro- 

 cured at will in the market ; and young ones are so timid and tender that 



