216 
LOCK : THE GROWTH OF 
which they present ; the reader being referred to the paper 
of Kraus already mentioned. On plotting the curves of 
growth for these six halms it is found in the first place that 
they all show a very striking agreement, amounting indeed 
to almost complete parallelism, a fact much less clearly seen 
from the table alone. Further, in spite of very great varia¬ 
tions from day to day, the curves show the closest agreement 
with that of the mean daily temperature. This varied con¬ 
siderably during the period of observation, the range of mean 
temperatures being from 1T6°C to207°C. There is perhaps 
also a slight general agreement between the curves of growth 
and the curve of relative humidity, but this agreement 
is very largely masked by the more obvious effect of 
temperature. 
The conclusions to be drawn from these figuresiare therefore 
entirely opposed to those of Kraus, but it is to be remembered 
that we are here dealing with quite different plants in quite 
a different climate. 
I now pass on to an account of my own observations. 
I.— HABIT AND MANNER OF GROWTH. 
These are described briefly by Kraus in his paper already 
alluded to. Most of the clumps at Peradeniya are, however, 
much older and more extensive than that with which Kraus 
worked, one of them being indeed the parent—by the 
vegetative method of propagation—of the Buitenzorg plant. 
The clumps of Dendrocalamus observed by me had each 
from 300-400 culms. Kraus describes the conical bud 
with its equitant leaf scales and terminated by a sharp and 
acuminate apex, which serves as a convenient terminal 
point for measurement. 
The remarkably upright growth of the young culms does 
not seem to have been much emphasized. The stems grow 
very straight upwards and so usually soon pass between the 
older stems, which are bent outwards by the weight of 
foliage which they bear. The brittle growing parts are 
