164 The Botanical Gazette. [March, 
which is exposed to the full effect of the sunlight. Among 
these are gigantic specimens of Cereus pruinosus and ciner- 
ascens, which have attained a height of six meters, a fact that 
seems to prove that such plants also may be able to tolerate 
a damp atmosphere. The author calls attention to the fact 
that the depression of transpiration in Buitenzorg is not so 
great as formerly stated by certain botanists. Indeed, it is 
not unusual to see that several plants show the effects of the 
exposure to the sun by the wilting of their leaves. The strong 
imbibition of the cell membranes of the leaves allows a cot- 
siderable transpiration to take place even in an atmosphere 
which is almost saturated with moisture. It is, therefore, not 
correct to suppose that the plants in the damp climate of 
Java are only able to transpire in a very small degree. There 
are in Java several plants which really need considerable evap- 
oration but seem to thrive well in the moist atmosphere. 
This is due to the fact that such plants have gradually changed 
their character and very often, also, their habit. This is, for 
instance, the case with the cultivated rose, which has ombro- 
phobic foliage, and which only produces very few leaves and 
small flowers in the garden at Buitenzorg. But the skill of 
the cultivator has nevertheless succeeded in producing a few 
specimens with large and odorous flowers. This is interest- 
ing, since, according to Teijsman,? there is not a single native 
species of Rosain Java. Several varieties of these cultivated 
roses have changed their ordinary habit by keeping te! 
young leaves hanging for quite a long time and by being 
deep red from anthocyan, before they attain the green color. 
Some other varieties, which were unusually leafy, showed thet 
the ombrophobic character of the normal leaf had been moe 
ified in these. The tea-roses thrive well as a rule, but theft 
are a few varieties of these which have, so far, entirely failed 
to develop. 
age. But it has also been shown in all plants that the ™ 
2 ae me 950. 
Teuade ee Catalogus plantarum quz in horto bot. Bogor. coluntut 
