"558 The American Naturalist. [Julys 
especially surprising is that the tender terminal leaves show 
no signs of wilt. 4:15 p.m. This vine has stood up remark- 
ably to-day. The transpiration demands have been large and 
there has been no wilt—not a trace—that mentioned as occur- 
ring on a few of the small basal leaves being evidently due to 
imperfect protection from the heat of the lamp when the stem 
was boiled. March 23, 11a.m. Sunny and hot; some wind; 
air of the house rather dry, and transpiration large. No wilt 
of the foliage except the margins and tips of the blades of 
three big leaves midway up the stem. These are slowly dry- 
ing out. 12:30 p.m. The greater part of the foliage on this 
vine is still turgid and normal in appearance. The tips and 
margins of the three leaves above mentioned are crisp, but 
this injury involves only a small part of each leaf. Transpira- 
tion active. Temp. in sun 30° C. Dry bulb 26.5° C.; wet 
bulb 22° C. 3:00 p.m. Slight, if any, change. Nearly all of 
the leaves are turgid and entirely normal in appearance, in- 
cluding all at the top of the vine. 4:20 p.m. No change 
since the last record. The vine stands up well. Temp. now 
24° ©. Active transpiration all day. March 25, 1:15 p. m. 
The vine stands up well. Nearly all of it is perfectly healthy, 
including the tender upper part, but portions of the lower 
leaves already mentioned are slowly drying out and in a very 
interesting manner, i.e., after the fashion of the California 
vine disease, the larger veins and their branches and a little 
of the adjacent parenchyma remaining green, even dark 
green, while the parenchymatic areas between the veins, espe- 
cially at the apex of the blades and on the margins, are be- 
coming first yellow and then a dead brown. 5:30 p.m. Vine 
stands up beautifully. It is four days since the stem was 
killed by the hot water. March 26, 2:45 p. m. A great 
change for the worse since yesterday. All of the foliage has 
now wilted (as yet only the blades) and the large leaves mid- 
way down as well as the smaller lower ones are rapidly drying 
out. March 27, 1:20 p.m. All of the leaves are now crisp, ex- 
cept a few very small flabby ones which are in the vicinity 
of a half grown fruit from which they are drawing water. — 
The stem is still turgid but some of the petioles begin to droop. — 
