390 Maternal Inheritance and Mendelism 



In this form the death-rate is 72 7o. varying, in individual cases, 

 from 18-3% to 94-9%. 



We have observed moreover that the death of the embryo inside 

 the egg took place in its earlier stage. So we often found some dead 

 eggs in August or September when a white patch appeared in one side 

 of the Qgg (Fig. 8) which gradually became enlarged in size and at last 

 the clear crimson colour became paler, while others were found dead 

 after the embryo had completely developed. The majority of the 

 deaths seem to occur, however, in the earlier developmental stage of 

 the embryo. 



Even in the same breed, the death-rate differed greatly according to 

 the colour of the es.s, and the voltine characters. Hence the divoltine 

 white eggs laid by the very same breed which laid the eggs recorded in 

 Table VI yielded a much smaller number of dead eggs than in the 

 univoltine coloured eggs. Ten batches of eggs selected at random from 

 fifty divoltine white egg-batches gave the following figures : 



Totals 2825 829 29-3 % 



that is to say, the average death-rate is 29-3 7o. which varies from 

 3*8 7,, to 72°/„ in individual batches. The average death-rate found in 

 fifty batches of eggs laid by the same breed is 19 7^, while iu the case 

 of univoltine eggs it is 84%, as already recorded in Table VI. In 

 certain cases it occurred that some crimson-coloured eggs hatched in 

 the summer. The death-rate of such divoltine crimson-coloured eggs 

 was nearly the same as that of the white divoltine eggs. 



Even more striking facts were observed when we examined the 

 number of dead eggs found in the batches in which three different 

 coloured eggs, normal, crimson, and albino, were found. These are the 

 F„ eggs laid by the cross, " H" albino and the divoltine crimson breed. 



