-rs- 



of the data in each case. A similar graph for the distilled 

 water cultures, entire period (table v), is also shown in figurei. 



The graphs'', ettfestantiate the conclusion that the op- 

 timal temperature for these tests lay between 28 and 31 , 

 almost surely not above 31° nor below 28 . Furthermore, the 

 form of the curve indicates that the optimum temperature in 

 every case lies about midway between the two limiting temp- 

 eratures just mentioned. It may, therefore, be stated that 

 the optimum temperature for these wheat seeds, for the periods 



considered, for the array of solutions used in these studies, 



o o 

 ai?d also for distilled water, surely lies between 28 and 31 , 



with the probability that it is between 29° ana 30°. 



m the preparation of wheat seedlings for water 



culture experiments (if the most rapid shoot elongation is 



desired 1, it is recommended that a temperature betwe-'-n 29 and 



30° be employed, and that if the temperature is not maintained, 



its fluctuation should not greatly exceed the range between 



o 

 28 and 31 . "t must of course be borne in mind that this re- 



comraendationis basea on "cnese pari/j.ou±ai vcifciob. Other tempera- 

 ture relations may well hold for other lots of wheat seed or 

 for other media than the series here used. It is especially 

 worthy of note that these sane sets of salts and salt 

 proportions ( or any one o^ them ) might exhibit 



