238 
LOCK : THE GROWTH OF 
Table XI,— could. 
No. 1. 
No. 2. 
■ 
Date. 
Height. 
cm. 
Day. 
mm. 
Night. 
mm. 
Height. 
cm. 
Day. 
mm. 
Night. 
mm. 
Remarks. 
1903. 
July 12 
1,009 
747 
13 
1,041 
35 
20*5 
776 
3*6 
18*6 
Fairly bright 
14 
1,070 
5-8 
16*3 
806 
5*9 
165 
Dull ; rain 
15 
1,109 
13*0 
18*5 
843 
100 
19*3 
Dull ; rain 
16 
1,145 
6*8 
21*4 
873 
4*3 
18*5 
Variable 
17 
1,183 
10*0 
19*8 
— 
— 
Dull ; rain 
18 
1,214 
4*8 
18*2 
— 
— 
— 
Variable 
In the case of No. 1 the average hourly growth during the 
day for the whole period was 6*27 mm. During the night 
(5.30 P.M. to 7.30 A.M.) it was 17*75 mm. or nearly three times 
as rapid. The most rapid growth on any day was 15*0 mm. 
per hour on June 28, rain having fallen steadily nearly all 
day. The rate of growth during the following night was 
17*0 mm. per hour. The least growth in the day time was 
2*5 mm. per hour recorded on July 4 and 9. Both days 
were rainless. The greatest growth at night was 23*0 mm. 
per hour and the least 13*9 per hour, which is more than 
twice the average hourly growth by day. 
For No. 2 the average hourly growth by day was 5*7 mm. 
and by night 14*5 mm., again approaching a ratio of 1: 3. 
The greatest growth by day was on June 28 being 12*4 mm. 
per hour ; during the following night it was 12*2 mm. per 
hour, this being the only case in which the rate of growth 
by day was observed to exceed that during the night. 
For the period during which records were made it appears 
that in the case of Dendrocalamus the ratio of the hourly 
growth by day to that during the following night varied 
between one of equality and one of nearly 1 : 8 ; the former 
on an exceptionally wet and dull day. At no time during 
the period under consideration did the sun shine steadily 
all day long. 
