Anderson: growth of cucurbita. 273 



Decrease occurred at the time of sunshine, high temperature, 

 low relative humidity and rapid transpiration of the leaves. 



Prom 8 A. M., October 1, to 8 a. m., October 2, there were 

 only slight variations in temperature, humidity and rate of 

 transpiration of the leaves. No decrease was exhibited. This 

 was due to the cloudy and rainy weather. 



Table VI 11. The complete cessation of growth from 10-12 

 p. M., October 7, was due to a cold wind. The vines were 

 sprinkled for one minute at 12:20 p. M., October 8; an increase 

 immediately occurred, but as soon as the leaves were dry, 

 decrease began. The effect of sprinkling vines at this stage of 

 the fruits' development was not so marked as at the grand 

 maximum. 



2'able IX. This table is inclusive of the time at the begin- 

 ning of the ripening period. The daily increase and decrease 

 are nearly equal. 



There was a cessation in growth from 8 p. m., October 11, to 

 1a. m., October 12. when the temperature was low and trans- 

 piration rapid, as indicated by the psychrometer. 



Tables X and XI. At the ripening period the two leaves near 

 the fruit had been cut away so that only the weight of the 

 fruit remained on the balance. 



October 13 there was a decrease from 8 a. m. to 3:20 p. M. 



From 2-6 a. m., October 14. the temperature outside of the 

 laboratory fell to O^^C . and the tips of a few of the 

 leaves were frosted. During the time of the low temperature 

 a decrease of sixteen grams occurred. This points conclusively 

 to the fact that the decrease in weight was due largely to the 

 transpiration of the fruit itself. At the time of the low 

 temperature it may be assumed that there was scarcely any 

 movement of sap. With the rise in temperature from 6-8 

 A. M. a slow increase occurred. This was again followed by 

 the daily decrease as soon as the sun began to shine on the 

 leaves. 



The transpiration of fruit No. 2 is given in this table, and 

 shows the same periodicity of decrease as the fruit attached to 

 the vine, being greatest at the time of least relative humidity 

 and highest temperature. 



Table Xfl. At the time of ripening and completion of the 

 ripening period, the daily maximum increase occurred during 

 the first two hours of the increase, which began as soon as the 

 leaves and fruit were shaded. This occurred from October 

 13-24, inclusive. The probable reason for this position of the 



