93 



probably does, have something to do with the stopping of growth 

 at that time. The question of nourishment was not studied, it 

 being impossible to determine the variation in nourishment if 

 there was any. 



From the button stage until the plant almost reaches maturity, 

 growth is at a very even rate, as will be seen in the curve in Figure 

 2. Of course the individual fungi vary some, but the average of 

 a number gives almost a straight line. There is an evident de- 

 pression in the curve, but this is not due to a normal decrease in 

 growth at this period, but due to the period of low temperature 

 above discussed. Of course in making the curve, it was neces- 



14 



12 



























^ 





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^ 



^ 











8 

 6 

 4 



















^ 



^ 













^ 













^ 



^ 











^ 







-3 























^ 



^ 



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^ 



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" 









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cm. 





y 































2 4 6 8 lo 12 14 i6 18 20 22 24 26 28 30 32 



Figure 2. A represents the average daily growth of a number of individuals 

 from the button stage to maturity, during a period of thirty-two days. Growth is 

 figured in centimeters. 



B represents the increase in length of the white area underneath the pileus, during 

 the same period. 



C represents the lateral growth of the pileus during the same period. 



sary to start all the fungi of a certain size at a certain place on 

 the curve, for instance all the fungi about 1.2 cm. in length were 

 started at 2 on the curve, whether they began to develop at the 

 same time or three weeks apart. From this point, the curve was 

 plotted, the average daily increment of growth being used for the 

 ordinates and the number of days for the abscissae. In all of the 

 fungi measured, the cold period came sometime between the 

 seventh and seventeenth days of their development. And as will 



