328 STATE HORTICULTURAL SOCIETY. 



This is not improbable when we know the influence which other ele- 

 ments exert. As it is impossible to say just when a plant begins to be 

 influenced by the temperature, it would be necessary to reckon from 

 the observed time of one of the earliest to appear. 



A table is also included, comparing various plants at the different 

 places indicated, together with the average monthly temperatures. 

 The temperature at Ames for the entire period was not procurable, 

 those given being based on the readings at Des Moines and Iowa City. 



H. C. Irish, 

 Mo. Bot, Garden, St. Louis, Mo. 



