3 8o 



BOTANICAL GAZETTE 



[may 



line represent the velocities for the earlier Xanthium 

 XI, while those below the zero line are from the 



later data from table XII. 

 These curves will be dis- 

 cussed later. 



Split peas 



The split peas offered 

 special difficulties from the 

 mathematical side, and no 

 attempt is made to present 



com 



analysis of the data given 

 in table VI. The variabil- 

 ity of the data is much 

 greater than in the case of 

 cockleburs. The absorp- 

 tion is fairly consistent 

 during the first hour, or, 

 at high temperatures, dur- 

 ing the first 15 or 20 

 minutes. After a certain 

 critical percentage has been 

 reached, however, they 

 show a remarkable rise 

 above the ideal curve in- 

 dicated by the first part 

 of the absorption. This 



Fig. 3 .-Logarithms of velocity plotted against cr jtical percentage is about 

 temperature: upper series plotted from table XI, • u r»f 



lower series from table XII; Xanthium seeds. 2 ° P er cent m the CESe 



the Tom Thumb variety 

 about 23 per cent in the Canada Green field pea, and about 30 



ircial. The reasons 



S \0 15 20 25 30 35 



• 



comm 



eral discussion. 



absorpt 



As the Small Scotch Yellow gives us the longest period of 



intake 



