m 
LOCK : THE GROWTH OF 
Plate XXII. Some interesting points are to be noticed in 
this figure. On July 30 35*9 mm. of rain fell. This 
was accompanied in No. 1 by an immediate increase in the 
rate of growth, which afterwards fell off rapidly. In 
the case of No. 4 the immediate increase in rate was 
very slight, but on the following days the rate became rapidly 
greater. At the time the height of No. 1 was 15*4 metres, 
that of No. 4 almost exactly one metre. It may here be 
pointed out that two halms of Gigantochloa, Nos. 11 and 
12, the growth of which is described below, showed upon 
these days an intermediate behaviour and were inter¬ 
mediate in height between the Dendrocalamus culms, 
Nos. 1 and 4. 
The month of August, 1903, was distinctly drier than the 
average. At the beginning of September a spell of wet 
weather set in, and at this time a few further observations 
were made with a theodolite upon two very upright culms of 
the same clump as Nos. 1 and 2, but which had not 
previously been measured. The estimated height of No. 7 
on August 28 was 20 metres, that of No. 8 on September 
5 being 23 metres. Neither these heights nor the records of 
daily growth are to be regarded as more than roughly 
approximate, nevertheless the average growth which they 
indicate cannot be very far wrong. 
From August 29 to September 3 inclusive the average 
growth of No. 7 was nearly 9 cm. per 24 hours, whilst for 
the following six days the average was over 21 cm. per day, 
the weather during the latter period being very much 
wetter. From September 6 to 10 the average growth of 
No. 8 was also over 20 cm. per day. 
For the whole period of thirteen days the average 
growth of No. 7 was nearly 16 cm. per day. We have 
already seen that at heights of from 10-15 metres the 
rate of growth of Dendrocalamus culms is nearly twice 
as rapid. 
