112 Cc. B. DAVENPORT 
two white; Guthrie got five chicks, one black, one spotted and 
three white. 
Guthrie found that a black hen containing a ‘white’ ovary, 
mated with a black cock gave black-plumaged chicks, of which 
two out of six had white feet. He concludes that the white condi- 
tion of the feet must have come from the engrafted eggs of the 
White Leghorn. In criticism it must be pointed out that the 
cross, white egg x black sperm, normally gives offspring whose 
plumage color is white, either pure or with black specks. The 
fact that all the offspring had black plumage proves that the eggs 
were the normal ‘black’ eggs regenerated by the black hen. The 
white toes are frequently found in the offspring of two black birds. 
Thus in my pen 1041 two extracted blacks (Sumatras) mated 
give ten black chicks in six of which white toes are recorded. The 
results of this cross of Guthrie’s confirm the conclusion that the 
transplanted ovaries were not functional and that the normal 
ovaries had regenerated. 
To test the possibility of such regeneration of ovaries I removed 
the ovaries of some hens in the autumn of 1909 and transplanted 
into them eggs from dissimilar hens. The operated birds were 
then mated to cocks resembling the soma of the so-called ‘foster- 
mother.’ Were there regeneration of the ovary the offspring 
should be of the straight breed; but if the ‘grafts’ persisted and 
became functional the chicks should be hybrids. 
Experiments 1 and 2, operations: The protocol of the grafting 
operations is as follows: 
No. 11379, pure-bred Dark Brahma bantam, hatched February, 
1909; made to fast two days. On September 29, 1909, injected 
with 0.005 grain of atropin in | ce. of water, etherized in about 
twelve minutes and opened up between two left intercostals. 
Large ovary, badly torn in removal, removal tolerably complete. 
One piece of ovary from no. 11605 fastened by cotton thread to 
mesentery near attachment of ovary. Sewed up. 
No. 11605, hatched March, 1909, from White Leghorn,-Houdan 
ancestry. Clean-footed, with five toes on each foot, V-comb, 
modified high nostril, plumage color white (with black recessive). 
On September 29, 1909, injected 0.005 grain atropin in 1 ce. of 
