Cannon : Transpiration of Fououieria 



407 



were performed Friday, Saturday and Monday — May 13, 14, and 

 16 — and they illustrate how promptly the plant availed itself of 

 the more favorable water-supply. 



Experiment No. ^, May ij 



Time. 



2:55 



3--05 



Per cent, of 



saturation. 



33-5 

 49 



Temperature, 



93 °F. 

 93 



The rate is 345 milligrams per hour. 



Experiment No. 5, May 14 



Time. 



9:48 

 9:56 



Per cent, of 



saturation. 



30 



66.5 



Temperature. 



94 



The rate is 956.2 milligrams per hour. 



Experwient No. 6, May 16 



Time. 



9:15 

 9:20 



Per cent, of 

 saturation. 



25 



66.5 



Temperature, 



92°F. 

 93 



The rate is 1875.6 milligrams per hour. 



Amount in 



miliigrams, 



122.5 



180 



Amount in 

 nailligrams, 



103.7 

 231.2 



Amount in 

 milligrams. 



88.7 



Summary of experiments on Foiiqideria No. i 



February 12 (without leaves) 



it 



<( 



March 



<( 



a 



May 



15 



24 (m leaf) 



(( 



cc 



4 



lo 



17 



13 



14 



16 



<l 



<C 



C( 



C( 



tl 



<( 



Transpiration in 

 milligrams per hour 



1.8 



s 



47-5 

 120 



24.4 



13-7 



345 

 956.2 



1875-6 



Transpiration of Fouquieria No. II. Experiments 7-9 



Fouquieria No. II, which is growing nearly north of the 

 laboratory and a httle lower on the mountain, is about the .size of 

 Fouquieria No. 1. The character of the plant and the general 

 nature of the habitat are indicated by figures 5 and 6, and do 

 not require further comment. 



