Spalding : Absorption of atmospheric moisture 



369 



first wholly green, though showing some loss of turgidity, while 

 the other lot, from another plant, were turning pale, but had not 

 become yellow. There was reason to believe that all were capable 

 of photosynthesis, but that all had reached a condition in which 

 more water could well be utilized. Inspection of the accompany- 

 ing table (I), however, shows that both lots of leaves iailed to gain in 



Table I. Fouquieria splendens. October 27-28, 1905. 



No. 



Time. 



10.30 A.M 



IO.35 " 



Weight. 

 9.257G 

 IO.677 



Loss or Gain 



Conditions. 



2.10 P.M 



2.15 



<i 



9.236 

 IO.654 



0.021 Loss 



1 



4.10 



4.15 



a 



0.023 



i i 



6& 



4.40 



«( 



9-234 

 10.652 



0.C02 



i . 



4-45 " 

 October 28 



6.43 A.M 



6.50 





1 

 2 



10.42 «* 



3-33 P.M. 



9- 23 1 

 10.648 



0.002 



a 



9.225 

 IO.637 



O.OO3 



O.OO4 



a 



» » 



O.OO6 



O.OII 



«c 



3-37 



<< 



9.167 

 I0.55S 



9.164 

 I0.5S4 



O.O58 

 O.O79 



O.OO3 



O.OO4 



a 



<< 



<i 





Weighed soon after gathering. Re- 

 corded relative humidity — 25 per cent. 



Weighed soon after gathering. Re- 

 corded relative humidity = 25 percent. 



After exposure to currents of air in 

 laboratory. 



After exposure to currents of air in 

 laboratory. 



After exposure to nearly saturated at- 

 mosphere. 



After exposure to nearly saturated at- 

 mosphere. 



After exposure to open air of labora- 

 tory. 



After exposure to open air of labora- 

 tory. 



After exposure to nearly saturated at- 

 mosphere. 



After exposure to nearly saturated at- 

 mosphere. . 



After exposure to sunlight in open air. 

 After exposure to sunlight in open air. 



After exposure to nearly saturated at- 

 mosphere. 



After exposure to nearly saturated at- 

 mosphere. 



weight during two hours exposure to a nearly saturated atmos- 

 phere, and even lost slightly when kept in it over night. More- 

 over, following exposure to sunshine in the open air for some three 

 hours, during which the two lots lost 0.6 and 0.8 per cent of their 

 weight respectively, they still failed to show any increase of weight 

 after being kept nearly five hours in a practically saturated atmos- 

 phere. It is important, however, to note that in every case, dur- 

 ing their stay in moist air, transpiration was reduced to such a 

 degree as to amount essentially to complete suppression. 



