224 
LOCK : THE GROWTH OF 
In the case of Dendrocalamns, during the earlier periods 
of growth when the height of the growing halm was from 
1-5 metres, the leaf point which formed the apex of the 
bud opened out and was replaced by the next younger, 
approximately once in 24 hours. As the halms grew 
upwards this process took place at an interval gradually 
increasing up to as much as 48 hours : and later on this 
became still greater. The new apex appeared in fairly young 
halms, at a distance of from 1-2 centimetres below the 
old one. In taking hourly measurements, growth was 
recorded at the old apex for the hour in which the change 
took place ; the position of the new apex was at the same time 
noted and the next hour’s growth measured from the new 
point. In making daily records the height was always 
recorded at the actual apex as it existed at the time when 
the measurement was taken. The error thus introduced, 
which is usually less than a centimetre, is not sufficient to 
affect the character of the curve of growth to a material 
extent. 
As the halms grew upwards bamboo ladders were used in 
order to reach the apices. 
The last few daily measurements of No. 1, those namely 
from August 1-13, were taken by means of a theodolite. 
This instrument read only to J min. (English scale) corres¬ 
ponding to about 1 centimetre on the vertical culm, since 
the theodolite was set up at a distance of about 35 metres. 
The culm under observation bent over at the top towards 
the instrument in an arc of a circle whose centre was ap¬ 
proximately the theodolite. The whole error of these 
observations does not probably exceed 2-3 centimetres. 
Later on a few further observations of still taller culms 
were taken with the theodolite. But in these cases the 
culms had become so thin at the upper part as to be swayed 
by every breath of air and very considerable errors are thus 
introduced. The curvature of the upper part of the culms 
also became very marked at this time, and I was unable to 
