MACDOUGAL AND SPOEHR— GROWTH AND IMBIBITION. 301 



i6° C 2:00 P.iM. Rate 2.4 mm. daily during previous 6 hours 

 at 18-16° C. 



Heat was again turned on, and the control set at 25° C. This 

 point was reached in 2 hours. The rate during this time was 4.8 

 mm. daily. 9:00 P.i\L Rate 2.7 mm. daily during previous 3 hours 

 at 25° C. 



4, 8:00 A.M. Rate 6.6. mm. daily during previous 9 hours at 

 25.5° C. II :oo A.M. Rate 5.6 mm. daily during previous 3 hours 

 at 25° C. 



Control reset and temperatures of 32° C. were reached by 3 P.M., 

 the rate during this period of 4 hours being 6 mm. daily. The 

 temperature rose from 32° C. to 36° C. during the next 3 hours. 



5, 12 Noon. Rate 9.6 mm. daily during previous 4.5 hours at 

 34-35° C. 3:15 P.M. Rate 9.9 mm. during previous 3.25 hours. 



Current was now cut to reduce temperature as follows : 3 45 P.^NI. 

 Temperature 26° C. 5:30 P.M. Rate .5 mm. in 1.25 hours at 

 29° C. at rate of 9.5 mm. daily. 8:00 P.]\I. Rate 8.1 mm. daily 

 during previous 2.5 hours at 27° C. 



6, 8 :oo A.M. Rate 7.2 mm. per day during previous 12 hours at 

 24° C. 



Earthquake disarranged record. Current cut off. 7:15 P.M. 

 Temperature 19° C. 



7, 8:00 A.i\I. Rate of 3.2 mm. per day in previous 12 hours at 

 18° C, which fell to 2.8 mm. per day during following 2 hours at 

 18° C. 



The shoot was now 12.2 cm. in length. Record was discon- 

 tinued until August 14, during which time the plant stood at 16- 

 18° C. and gained 18 mm. in length, or about 3 mm. per day. 



ly. Current on heater at 2 P.M. resulted in a temperature of 

 23° C. at 9:15 P.M. 



18, 8:00 A.M. Rate of 2.1 mm. during previous 10 hours at 

 23° C. 



ig, 8:00 A.M. Rate of 3.3 mm. daily during previous 15.5 hours 

 at 25° C. 



2^, 8 :oo A.M. Plant had stood at 25° C. for 4 days. Rate dur- 

 ing previous 16 hours was 5.7 mm. per day at 25° C. 12 Noon. 

 Rate 7.8 mm. per day during previous 4 hours at 25° C. 



