Feb.3,1923 Use of Alternating Temperatures inSeed Germination 319 
For a number of alternations the temperature of a chamber, as indi¬ 
cated by the thermometer in its top, was held at about its highest point 
for some time before cooling was begun. In these cases,~as shown in 
HOURS, FROM T/ME HEAT/NG WAS BEGUN 
Fig. 16.—Curves showing temperature changes in four positions on top tray of a chamber which 
was heated and cooled. Thermometer bulbs No. i and 3 were within wet blotters; No. 2 and 4 
were in the air about one-eighth inch above wet blotters. 
Figure 14, the curves representing temperature changes within the 
chambers became broad and round at the top, instead of sharp and 
narrow as in Figure 13, and the highest temperature reached within the 
blotters was nearly the same in all parts of the chamber. Figure 14 
