on Vegetables, 'with reference to their Temperature. 9 



In this table we are presented with an unusually high 

 amount of drying power, the effect of which is to produce so 

 rapid an evaporation, that the heat generated in the most ac- 

 tive parts of the plant is neutralized. This group of plants, 

 although very vigorous when examined, was drooping in six 

 hours after from excessive evaporation. 



Table F. 

 June 14th. Arum Walteri, with plenty of moist earth. Ther- 

 mometer 86° Fahr. Dew-point 62°. Drying power 24-°. 

 Clouds rising. 



Table G. 

 The same group as in Table E, again examined six hours 

 after collection, about half an hour after the falling of rain. 

 Plants very vigorous. Thermometer 75° Fahr. Dew-point 

 65°. Drying power 10°. Clearing. 



In tables E, F and C of the previous section the drying power 

 is extremely high, 22°, 24°, and 25° Fahr. ; the effect accord- 

 ing to hypothesis should be an exalted evaporation, and we 

 find accordingly that all parts of the plant in these three tables 

 exhibit a temperature below that of the atmosphere. 



