142 The Botanical Gazette. [April, 
Exp. j. Vigorous young Helianthus, 14™ high, was allowed to droop for want 
of water until it bent over tothe table. Its top, containing four young leaves 
of w 1 wer 
and the bud, was allowed to ap. hae a ate ater, cays two low 
leaves in i air. It showed n of im ment and s ied, 
Exp vigorous Silopthas ante ey shoe 18in igs allowed to droop 
for want of water until they bent over in a curve tothe table. Thetwo large 
their leaves were left outside. Whole placed in Wardian case where transpita- 
tion could not be too rapid. Both plants continued to wilt until dead, the 
leaves in water turning yellow oot soon dying also 
Lxp. 1, Young Begonia with two strong leaves, one ‘plac ced in basin of water, 
one it _ placed under a bell jar open at top; plant continued to wilt 
ied. 
On this division of the subject, the experiments are too few 
and inconclusive, but this is perhaps of the less importance, 
since such absorption could have very little opportunity to 
occur normally in nature. Henslow found that an uninjured 
plant of Mimulus moschatus lived for months after one of its 
shoots had been immersed in water, but this was plainly by 
virtue of the adventitious roots which it put forth. 
4. Do JO aes plants, through their green parts, absorb 
water vapor? 
Exp. m. Strong young Pelargonium, wrapped i in rubber cloth, weighed complete M 
187.1048"; dried rapidly by current of air dried by CaCl, until in two days 
weighed 181.1868"; then in Wardian case three days, wt. 180.1358) thes - 
wet chamber, nearly soir eo in one day wt. 179.5528™; in three days, 17 
7326; four days, 178.2128™; seven days, 176. 8 308m: and many new leaves re 
pearing'’; nine days, 175. gaom, Satine: to beet pose in a weight 
two months until it died. bed 
xp. n. Cane but well-rooted Co/eus, wrapped in dee ms weig! 
182.6458"; dried in on bell jar for four st weighed 181.802", droo ue 
placed in satura ted bell jar; after one day 181.3762", two ‘Oath 180.7 til 
ee to lose weight, dropping old ces and putting out new ones es ua 
ie 
£xp. 0. Strong young ik wrapped in rubber, all old leaves removed. Pits 
left in Wardian case s ral day cet recover; put out new leaves; t pti 
er ia jar and it teat weight until it died. Young pio “ 
ma ik Several plants died for want of water in an atmosphere ait 
These latter experiments prove nothing new, but they ee 
their value in this connection as showing forcibly thata pa 
may die for want of water in an atmosphere saturated witht 
If the absorption of water vapor were an ‘important norm 
ee of leaves” this ought not to be so rapid and positive 
as i 
th This was several times noticed, and is referred to by Henslow, who thie 
at young leaves are a medium of absorption, - are hence put out that 
mie bers when water from ria air isneeded. It is also worthr emark . 
evi “ng was observed indicating that when a leaf attached to Its P 
jured, it may absorb water through the injury. 
