Gucurbita maxima and G. Pejpo. 



Ill 



From this it will be seen that the entire gain in weight, 

 during the nine days of experiment, was 27'5 pounds, or a daily 

 average of 3'05 pounds, the greatest gain for any day, occur- 

 ring August 11th and 12th, and amounting to 5*5 pounds for the 

 twenty-four hours. During this time the sky was obscured by 

 rather heavy clouds, and showers were of frequent occurrence. 

 The temperature was moderately high, the average for the 

 twenty-four hours being 22*6° C. 



The least gain was noticed August 13th and 14th, and 

 amounted to 2"0 pounds. During the hours of day, the trans- 

 piration from the plant was excessive, and all the leaves, buds 

 and flowers were drooping. During the night, there was a 

 light shower. The temperature was quite high, averaging 

 25° C. for the twenty-four hours. About the first of September, 

 when the squash was taken from the scales, it weighed 96 

 pounds. 



General Summary. 



Average rate of movement. It is tolerably safe to assume that, 

 from an aggregate of 436 distinct and complete observations 

 upon the motion of the tendrils under all conditions of temper- 

 ature, sun and humidity, some figures can be obtained which 

 will represent pretty nearly, the true normal rate of movement, 

 under all the conditions to which the plant is ordinarily sub- 

 jected. This we find to be O351 om per minute. 



Maximum rate of movement. By reference to the following 

 table, it will be possible to trace the relation which movements 

 of greater and less rapidity bear to the temperatures for corres- 

 ponding periods, and thus determine the specific influence of 

 higher or lower temperature in promoting activity. 



Relation of Rate of Movement to Temperature. Degrees C. Distances in centimeters. 





1 



o 



3 



4 



5a 



5bc 



6a-b 



7a 



7b 



8a 



8b 



8c 



9 



Means. 



Average rate 



per minute . 



Max. rate of 



0-54 



0-36 



0-52 



014 



0-39 



0-37 



0-29 



0-38 



0-205 



0-516 



0-483 



0-176 



0-191 



0-351 



movement . . 

 Tern, for max. 



2-06 



1-76 



3-55 



0-85 



1-44 



4-55 



6-50 



0-92 



0-555 



1-20 



2-60 



0-65 



217 



2-216 



rate move... 

 Minimum rate 



of movem'nt 

 Tern, for min. 



28-3 

 0-21 



26*1 

 0-18 



27-8 

 •013 



35-5 

 •031 



27-2 

 013 



30-9 

 •043 



24-4 



•047 



29-0 

 •053 



20-0 

 0-08 



31-7 

 0166 



22-2 



o-io 



20-5 

 0-023 



21-1 

 0-02 



26-5 



0-S4 



rate move... 31*1 



31-7 



29*5 32-2 21-7 



16-7 21*1 



311 22-8 



34-0 



24-0 



19-5 



20-0 



25-S 



We find that of the thirteen sets of observations here given, 

 only four show waves of rapid movement during the morning, 

 these occurring between the hours of 7.00 and 10.20, and in 

 no case, — unless we make exceptions in favor of No. 9 — repre- 

 senting the absolute maximum of movement for the entire life 

 of the tendril. The remaining nine show the waves to occur in 



