Growth in Eriogonum nudum 



233 



Jy.6. 



Min.: 

 Rate: 



EFFECT OF SHADE. 

 Beginning with 8 hr. reading. Sunlight all day: 



60 60 



45 



60 shade 



removed 

 50 13 hr. 



25 



o 



60 



10 

 -60 

 60 



60 



5 12 

 o -75 

 60 



60 

 5 



30 

 40 



60 

 o 



35 30 25 20 



Jy.8. 



Min.: 



Rate: 

 Evap'n: 

 Temp. : 

 Min.: 

 Rate: 

 Evap'n ; 

 Temp. : 



Jy- II- 



Min.: 

 Rate: 

 Min.: 

 Rate: 



Beginning with 8 hr. reading. Sunlight all day: 



60 60 



60 



60 



45 -20 -45 -10 



i.o 1.85 3.15 4.1 



61 72 74.5 



60 60 60 60 60 



90 65 115 55 50 



3.9 2.7 1.7 



66 63 60.5 55 

 Beginning with 8 hr. reading. 



43 77 23 37 60 60 32 



49 12 13 -37 30 32 24 



21 60 60 60 60 60 60 



43 55 50 40 50 37 20 



plant 

 shaded 

 II hr. 



plant shaded 

 12 hr. 



5 55 shade 60 60 



removed 



o 93 12 hr. -15 o 



2.85 (shade) 4.25 4.00 4.00 



70 69.5 71 72 



60 



15 



60 



42 



Sunlight till 14 hr. after which high fog. 

 plant shaded 38 39 shade removed 

 12.32 40 46 13.39 



That this is not a direct light effect was proved by the occurrence of 

 similar changes in growth rates during continuous brilliant insolation, 

 by means of raising the humidity within the chamber. To this end, 

 the chamber was closed with a sheet of uviol glass. The back of the 

 chamber was closed also, and the mirrors were placed behind the inter- 

 node. The temperature rose to a high value within the chamber. This 

 was done on six occasions. The data indicate the amplitude of these 

 changes. 



Jy- 12, 



Min.: 

 Rate: 



Min.: 

 Rate.: 



Jy. 



Min. 



Rate: 

 Min.: 

 Rate. : 



Min.: 



Rate.: 



EFFECT OF RAISING VAPOUR TENSION, 

 beginning at 8 hr. Sunlight till 14 hr.; then "weeping" fog (a fine drizzle). 



60 

 II 



60 

 50 



60 



7 



60 



43 



60 

 13 



60 

 50 



25 

 29 



60 



42 



35 

 -22 



60 



35 



humidity raised to 60 

 ca. saturation at 57 

 12.04 



humidity lowered 

 at 13.06 



15, beginning with 7 hr. reading. Sunlight till 10.54, then high fog 10.54-16.15 



60 60 30 



uviol glass 

 mirrors at 

 42 28 20 8.30 hr. 



II humidity lowered 16 

 82 to normal at 10 o 



35 red glass in 30 10 20 



place of blue 

 69 at 12 90 -30 45 



30 



