CHANGE IX VOLUME OF EGGS AT FERTILIZATION. 



8.S 



obtained by the latter method are reported, whereas the varia- 

 bility curves are based on factored measurements by the pla- 

 nimeter. The same curves were first constructed from the origi- 

 nal measurements. 



ON THE CONSTANCY IN VOLUME OF THE EGGS OF A 



SINGLE FEMALE. 



In Table I. are given the diameters of 280 different eggs derived 

 from one female, measured in groups of ten, at three distinct 

 periods after removal from the ovaries. The results show not 

 only a remarkable constancy for the ova of a single individual, 

 when grouped in this manner, but what is of even more immediate 

 importance, they show that in four hours, the eggs do not undergo 

 any change in volume discoverable by the methods employed. 



TABLE I. 



FEMALE B. 



ON THE VOLUME OF THE EGGS OF DIFFERENT FEMALES. 



To what extent the average volume of the ova of different 

 females is constant, I am unable to say, since scarcely anything 

 much less than one hundred eggs from each would suffice to 

 decide the question. One would not expect great constancy 

 however unless the numerous factors entering into the result 

 were identical. In the one case in which I have the requisite 

 number of measurements for such comparison, the average 

 diameter is the same as that found for female B. 



