TEMPERATURES OF SMALL FRUITS 



179 



protluction of heat in certain plant parts. In the investigations 

 of Richards, however, the increases in temperature due to 

 wounding were relatively small, i.e., 0.20°C. to 1.2°C. ((8), p. 

 38-40). It is, then, hardly conceivable that any large part 

 of the difference in temperature was due to the so-called "wound 

 stimulus." In any case the relations between the berries in 

 different locations and at different times of day, as well as that 

 between green and ripe fruit, are significant. 



Table 2, giving the observations at Hammond, Louisiana, 

 April 23, 1917, shows the relation of the temperature of the 

 inside of the strawberry to that of the air just outside of and 



TABLE 2 



* Temperatures of strawberries in degrees Centigrade 



between the berries in the box, and these data have been sub- 

 stantiated by other observations elsewhere. ' . 



The temperature of indi^'idual berries in the sun varies widely 

 with the exposure of the berries. The tem-peratures given in 

 table 2 are for ripe berries, but green berries showed similar 

 variation. For example, green berries in the same fieldshowed 

 at 2 p.m.. on the same day, a temperature of 34°C. in the shade 

 and temperature ranging from 39°C. to 45°C. in the sun.^ 



'' In connection with these notes on the temperature of strawberry fruits the 

 observations of Seeley on the temperature of strawberry leaves should be noted. 

 (Seeley, D. A. The relation between temperature and crops. Nineteenth Re- 

 port Michigan Academy of Science, 167-196, 1917.) Summarizing the results 

 of 304 simultaneous observations of strawberry leaf and air temperature 

 made at midday in 1915 and 1916 at East Lansing, Michigan, he says, 



THE PLANT WORLD. VOL. 21, NO. 7 



