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RAYMOND PEARL AND WILLIAM FREEMAN SCHOPPE 



death, as would be expected. The operation protocol on bird 

 no. 9018 shows that the ovary was in a diseased condition at 

 the time of operation, but at the time of killing the ovary was 

 in normal condition. The protocol states that a "large part of 

 ovary was removed." So far as could be estimated, a larger 

 portion of the ovary was removed at operation in this case than in 

 any other, with the possible exception of 9017. 



In order to make clearer comparisons, table 7 has been calcu- 

 lated from the data of table 6. 



^ One case only. 



From these data a number of points of interest appear. In 

 the first place, it is evident that the number of visible oocytes 

 on the regenerated ovaries is substantially the same as the mean 

 number on the normal unoperated ovary of the same breed. In 

 the case of the Barred Rocks the difference is 1615 — 1487 = 128, 

 an obviously insignificant difference. In the Cornish Indian 

 Games the difference is even smaller, amounting to 1550 — 1523 = 

 27. In the latter case we have, unfortunately, only a single nor- 

 mal count, rather than a normal mean. 



If we add to the number of oocytes found upon the regenerated 

 ovary those upon the piece removed at operation to get the total 

 number of visible oocytes the bird produced in its life, we get a 

 considerable excess over the number produced by normal un- 



