138 



Miss E. S. Norton on the Weight of 



7i 

 n3 



Explanation of the Diagram. 

 Eacli line in tlie diagram shews how an individual egg decreased in 

 weight from day to day. The weight in grammes (shown at the 

 sides) determines the height of the line, and the time in days (shown 

 at the top) determines the length of the line. Thus, the line of the 

 egg 1 commences at the point denoting 59'8 gr. on the beginning of 

 the first day of incnbation, and it ends at the point denoting 51 gr. 

 on the 22nd day ; the egg was opened that day and was found to 

 contain a dead chick. X marks the approximate time of the death 

 of the chick or embryo. 



