1 10 HISTOLOG r AND PHYSIOLOG T. 



Diatoms and some of the higher Sea-weeds (Fucacece, 

 FloridecB) flourish. Of our ordinary land plants, subjected 

 to different temperatures, the greatest growth of the 

 plumules took place as follows : 



Pea 78.8° F. 



Wheat 92.7° F. 



Indian Corn 92.7° F. 



Scarlet Bean 92.7° F. 



In other experiments it was found that the most rapid 

 growth of roots was at the following temperatures : 



Scarlet Bean 78.8° F. 



Pea 79.9° F. 



Flax 81.3° F. 



Wheat 83.3° F. 



Indian Com 92.7° F. 



The following table shows the lowest (minimum), the 

 most favorable (optimum), and the highest (maximum) 

 degree of temperature at which seeds of several plants will 

 germinate : 



Metastasis may take place at lower temperatures than 

 assimilation. In the growth of many plants in spring, at 

 the expense of the reserve material, metastasis takes place 



