64 



Win 



lam 



B. H 



erms 



is convinced that this is the true method of growth measurement 

 and curves constructed on this basis show the facts in a remark- 

 ably clear manner. 



It will be seen at a glance th?.t the teiidency is for growth to de- 

 crease in rate uniformly, and that there is a wave-like rise and fall 



140% 

 130% 

 120% 



IIC% 



100% 



90% 

 80% 

 70% 

 60% 



50% 

 40% 



30% 

 20% 



10% 



0% 



-10% 

 -20% 





34567 



9 10 II 12 13 14 15 16 



Fig. 4 Growth curve of Lucilia caesar Linne, based on percentage increments. Derived from Table 

 II, column lo; x = days; y = percentage increments. Crosses represent point of migration and point 

 of pupation. 



With a deep trough and a high crest at the beginning of growth 

 which gradually diminish with age. It is apparent that the con- 

 clusions reached by Minot ('91) also apply here, viz: "The 

 study of the individual variations yields two important conclu- 

 sions: First, That any irregularity in the growth of an individual 



