122 Cc. B. DAVENPORT 
CONCLUSIONS 
In the six experiments described above there is no evidence that 
the engrafted ovary ever became functional but all results are in 
accord with the conclusion that the more or less completely extir- 
pated ovary regenerated and produced an abundance of eggs. 
With the results the data of Dr. Guthrie’s paper are not in dis- 
accord. His data, like ours, furnish no evidence for the survival 
of the engrafted ovaries, far less of an effect of the soma of the 
foster-mother on the introduced germ plasm. 
Cold Spring Harbor, N. Y. 
September 26, 1910. 
POSTSCRIPT 
On January 4, 1911, No. 11693 ¢ was killed and opened on the 
left side. An ovary of fairly typical size for a hen entering her 
second year of laying was found. It contained numerous eggs, 
4 to 5 mm. in diameter. Slightly ventrad of the main artery of 
the ovary is an irregular mass 5 x4 X2 mm. of cheesy consistency, 
imbedded in and covered by peritoneum. Its general appearance 
is that of a dried, hardened ovary, with clear traces of follicles. 
It doubtless represents the engrafted ovary, entirely encysted 
in the peritoneum. : 
January 30, 1911. 
LITERATURE CITED 
Davenport, C. B. 1906 Inheritance in poultry. Publication no. 52, Carnegie 
Institution of Washington. 
1910 Inheritance of plumage color in poultry. Proc. Soc. Exper. 
Biol. and Med., vol. 7, p. 168. 
GuTurig C. C. 1908 Further results of transplantation of ovaries in chickens. 
Jour. Exp. Zodl., 5, pp. 563-576. 
