274 BOTANICAL GAZETTE [APRIL 
TABLE VIII. 
COVILLEA TRIDENTATA. December 1904. 
No.| Date Time bears ie eo Samy Period of treatment 
1 | Dec. 26 | 11:05 A.M. | 2.529 
2217 P:M. |2.5383 | 6,4 gain After wetting ay 3 na 12 min. 
28 | 10:32 A.M. | 1.957 {22.9 loss drying 4 
2:18 P.M. | 1.996 | 2.0 gai = wetting nearly 3 hrs. e min. 
29|| IorSo A.M. | 2.388 | 9.6 “ es 3 
2 26 | 11:12 A.M. | 2.434 : 
2:35 P.M. | 2.453 | 0.8 gain | After wetting nearly 3 hrs. 23 min. 
28 | 10:40 A.M. | 2.234 | 8.9 loss ** drying 44 hrs. 05 min. : 
2733 PM. | 2.258.| 1.1 gain “wetting nearly 3 hrs. 53 min. 
20: | FR203 Ai M. | 2-416-| F.0 “* if oo 2. ga * 
3 26 | 11:21 A.M. | 2.261 
2:58 P.M. | 2.281 | 0.8 gain After wetting nearly MA hrs. 37 min. 
28 | 10:48 A.M. | 1.980 [13.2 loss drying 43 hrs min. 
2:45 P.M. | 2.020 | 2.0 gain sa wetting nearly 3 “hrs. : min. 
29 | i1:14 A.M. | 2.225 a es © 
4 26 | 11:28 A.M. | 2.646 
3:03 P.M. | 2.688 | 1.6 gain After wetting nearly 3 hrs. 35 min. 
28 | 10:55 A.M. | 2.357 |r2.3 loss drying 43 hrs. 52 min. 
2:56 P.M. | 2.415 | 2.5 gain ‘“* wetting nearly 4 hrs. 1 min. 
2Q | 11:23 A.M. | 2.766 |14.5 “ is ee = ae ae 
under natural conditions. This shoot, with its large, fresh, turgid 
leaves, lost water by drying approximately twice as rapidly as did _ 
those from dry ground, with their much smaller leaves and firmer 
tissues, and on subsequent wetting absorbed far less than the 
latter in proportion to previous loss. Unlike these, moreover, the 
leaves of the first specimen, in the course of alternate drying and 
wetting, lost their fresh look and became discolored. The impres- 
sion was received that this specimen, taken from a perfectly fresh 
plant and requiring no additional supply of water, suffered patho- 
logical changes in the course of the treatment to which it was sub- 
jected, while the others, coming from dry ground plants in need 
of water, absorbed it as by a perfectly normal process. Even these, 
however, were not in a condition for rapid leaf absorption when 
first cut, their gain per cent. being decidedly less for a given period 
than that exhibited by individuals of the same species during 
observations made before the December rains. In brief, the experi- 
ments of December 26-29, in connection with those of November 
1-9, indicate on the part of the creosote bush marked capacity for 
