84 



THE RATE OF GROWTH 



[CH. 



the little larva frees itself from the egg ; there is a retardation of 

 growth about ten days later, when the external gills disappear; 

 and finally, the complete metamorphosis, with the loss of the tail, 



10 



15 



20 



25 



30 



35 



40 

 days 



Fig. 13 Growth in weight of Silkworm. (From Ostwald, after Luciani 

 and Lo Monaco.) 



the growth of the legs and the cessation of branchial respiration, 

 is accompanied by a loss of weight amounting to wellnigh half 

 the weight of the full-grown larva. 



