298 MACDOUGAL AND SPOEHR— GROWTH AND IMBIBITION. 



at 14° or 15° C. on the 24th. Growth began at 14° C. on March 

 25 and at some point between 15.5° C. and 17.5° C. on the 26th. 

 Growth began at 17° C. after a night of shortening, at 19° C. on 

 the 31st after a night of shortening, at 15° C. on April i, at 18° C. 

 on the 2d and 3d, at 14° C. on the 4th and 5th, at 18° C. on the 

 6th, 16° C. on the 7th, at 18° C. on the 9th, 19° C. on the nth, 

 18° C. on the 12th, at 13° C. on the 13th, at 17° C. on the 14th, 

 22° C. on the i8th, 17° C. on the 19th, above 20° C. on the 19th, 

 and 21° C. on the 20th. 



Similar experiences with many other growing joints are in our 

 records. Thus we have the entry that on March 31 all growing 

 joints under observation began elongation at temperatures ranging 

 from 15° to 19° C. This single growing member began elongation 

 in temperatures rising from 9° to 10° C. early in its development 

 to 12° to 22° C. in its more advanced stages. Another joint. No. 

 2, began its daily growth at temperatures as follows : 



March 24, 10 : 00 A.M 21.5° C. 



The temperatures of the body at which growth ceased likewise 

 showed great variation as illustrated by the behavior of No. 14. 

 Thus on March 28, 191 6, elongation ceased abruptly when it reached 

 40° C., and the temperature of the air was 26° C. Growth stopped 

 at 35° C. at 1 130 P.M. on the 25th ; at 28° C. at 2 :30 P.M. on March 

 30, the temperature having been above that point since 10 A.M.; at 



