74 



MAYNIE R. CURTIS. 



TABLE II. 



SHOWING THE DATA ON THE TRIPLE- YOLKED EGG, THE Two DOUBLE- YOLKED 

 EGGS AND THE MEAN OF TEN NORMAL EGGS OF 6sK. 



Pearl's 1 conclusion "that the size of egg,-, is not directly pro- 

 portional to the number of yolks they contain." The data on 

 which he based his conclusion were taken from the eggs of differ- 

 ent individuals of various ages and the eggs were produced at 

 different seasons of the year. Since all these factors influence 

 the size and the proportion of parts of the egg it is interesting to 

 note that his conclusion is confirmed by the present observation, 

 made on eggs of a single individual laid in a period of three weeks' 

 duration. 



The data given in Table II. also show that the different parts 

 of the double- and triple-yolked eggs are in different proportions 

 than in single-yolked eggs. Fig 4 shows graphically for the eggs 

 of 6sK the mean weight of the egg and of each egg part for egg s 

 with one, two and three yolks. 



Both the diagram and the table show that the weight of albu- 

 men and shell are increased in double-yolked eggs. These 

 components still further increase in triple-yolked eggs, but the 

 increase in these parts is less than the increase in yolk weight. 

 This may be seen either from the apparent slope of the lines in 

 the figure, or from a comparison of the actual weight of the parts 



1 Loc. til. 



