

288 BOTANICAL GAZETTE [april 



time the temperature rose from 4 to 6° F. only above the tempera- 

 tures indicated, as shown by the continuous record of the thermo- 

 graph pen. The second was during the last 36 hours of the 

 experiment, ending October 10, when the pan again went dry. The 

 operation of the thermostat prevented any rise in temperature 

 above the normal. In fact the thermostat was so closely adjusted 

 that the variation in temperature at the hygro thermograph was only 

 from 1 to 2 F. at any time except when the door was open. 



The variation in humidity was somewhat greater on the bottom 

 or fourth shelf, although it was probably close to 90=*= 5 per cent. 

 On the first three shelves the humidity was 100 per cent throughout 

 the experiment, except during the times indicated. Room tem- 

 peratures and humidity were practically the same as in the first 

 experiment, not more than i° F., or 6 per cent difference between 

 the maxima and minima. The high humidity at room tempera- 

 ture was quite uniform, ranging from 94 to 100 per cent, average 

 96 per cent. The cold storage temperature and humidity were 

 just the same as in the first experiment. 



Behavior of fruit 



The first crop Bartlett pears were near the end of their life 

 period when first subjected to the experimental conditions. As a 

 result, 3 or 4 days after the experiment was begun nearly all the 





indicated 



skin, and the browning 



of the tissue. No data of value, therefore, concerning the effects 

 of high temperatures upon keeping quality, were obtained with 

 this lot of nearly ripe Bartlett pears. 



The second crop Bartlett and the Easter pears were green 

 enough to show a response, with wide enough differences, depend- 

 ing upon the temperature, to be of interest in substantiating the 

 first experiment, and to determine the effects of temperatures 



higher than those employed ii 

 are given in tables V and VI. 



The details of these 



indicated 



maturity in 



down may rapidly come about, regardless of the environment 



