6o 
Keeble . — The Hanging Foliage of 
Treub has well described the appearance which the young 
branches of such trees present: ‘Very young branches, with 
their not yet green leaves, hang flaccidly down as though 
they were fallen out of the bud 1 .’ Haberlandt, in a recent 
book of travel, describes them as looking as though ‘poured 
out ’ of the bud 2 . 
Treub 3 and others have observed how rapidly the elonga- 
tion of the shoots takes place. The following instance observed 
by me illustrates this. An unopened bud of Brownea grandi- 
ceps was ten inches long at six p.m. The next morning 
at seven o’clock the bud had opened and the petioles of 
the pinnate leaves which had issued from it were each a foot 
and a half in length. During the next two days they grew at 
the rate of little less than a foot a day, and had at the 
end of that time practically attained their full length. 
During this elongation the leaflets are rolled longitudinally 
on themselves with their upper surface inwards. Similarly 
in Anther stia nobilis , during the short period of elongation, 
the very small, tender, hanging leaflets are folded on them- 
selves along their midrib so as to include the upper surfaces. 
At first sight it might be imagined that this folding and 
rolling are devices for protection of the upper surfaces ; but 
when the transientness of this condition is remembered, 
and especially the great rate at which the leaflets have 
been separated by the elongating petiole, it seems more 
likely that the folding or rolling is rather to be explained 
by the ordinary laws of vernation than of special adaptation. 
In a few days the still hanging leaflets of Brownea grandiceps 
unroll, those of A mherstia nobilis unfold ; these latter assume 
a bright red colour by the formation of rosy cell sap ; those 
of the former pass from a pink flecked with white to a 
greener hue. 
Several distinct views as to the significance of the hanging 
1 Treub, M., Jets over Knoppbedekking in die Tropen; Bot. Central blatt, 
Vol. xxxv, p. 329. 
2 Haberlandt, G., Eine botanische Tropenreise, p. 117. 
3 Treub, loc. cit. 
