GROWTH OF MATURE CLUMPS 23 
5, 1915, while a considerable proportion of the canes were not 
measured until after this date. The height at the time of the 
first measurement is given in the first row of figures in the table. 
Each column shows the growth figures for a single.culm during 
successive weeks, the first space in each column being for the 
week ending June 12. When measurements were not started 
until later than June 5, the first measurement of growth is 
recorded lower in the column, the number of blanks appearing 
before the first measurement of growth indicating the number 
of weeks after June 5 that the first measurement was taken. 
It will be seen that, as is usual in the growth of plant parts, 
the rate is at first slow and gradually increases until it reaches a 
maximum, after which it decreases as the culms assume mature 
size. The most rapid growth usually occurs nearer the end than 
the beginning of the growth period and takes place in the 
latter part of the rainy season. Three of the shoots showed 
a weekly growth in excess of 3 meters; the fastest rate was 
3.17 meters, or an average of 45 centimeters a day for a week. 
TABLE 8.—Growth of culms of Bambusa spinosa, at Division of Investiga- 
tion, Bureau of Forestry, Los Banos, Laguna, Philippine Islands. 
Data from report by Ranger Oro. 

Height in meters at first measurement. 
| ] | 
| 24 | 16 | -29 - 06 -40 | .14 - 40 18 -31 aot 




| 5 - = 
Growth in meters during successive weeks. 
ace 
| 
| 
| 
t 





. 04 | . 03 09 AOI teen eeeen eee eae O22 Baill Bi}330 Cnet a Paes ees 
13 | -09 | 16 (17) alee a area Ye 56 ie PO Pe 
13 09 20 . 038 ip |e See ees .84 146 eto le 
| 48 16 74 . 04 50) Ese =o 119 AN i sons Be | Sree eS 
| 73 elit - 82 . 04 -59 00 128 -8l 45 29 
~95 - 43 bets ae til 1.03 | 02 1.39 1.24 {iit .85 
1.43 - 83 1.81 v5, 1.23 10 | 2.48 1,22 | 1.11 1.13 
| 1B 1.10 2.02 31 | 1.68 54 2.45 1. 68 1.20 1.51 
| 1.56 | 1.41 2.19 atte | 1.65 | . 89 1.88 tal2Z Le 1.67 
1.34 | 13297) ZA Y - 86 | 1.76 Sh 1509 2.96 2.04 2.76 
1,22 | 1.49 133 1215 1. 26 | PS5 On} 2.92 2.40 | 1.81 2.33 
1.37 1.87 | . 94 1.20 | a bei) 1.63 1.84 | 1.33 2.638 2.02 
1, 48 1.73 1.02 | 1.09 | 1.91 2.44 1.63 2.88 1. 58 2k 
1.56 1. 89 | 1.10 1.77 | 1.96 | 2.12 1, 84 2.42 2.62 1. 60 
1.60 eat) 2.15 2.59 1.85 | 2.18 1.21 | 2.30 1.75 1.40 | 
2.85 2.75 | 1. 65 2.93 2.34 extO ae ee aes eee a 3 1.71 1. 66 
2. 44 | 2.33 2.02 3.05 1.54 | B09 |e eee ae 1.05 157 | 
1.53 1.94 | 1.26 2.88 - 715 | ZAstoy Up |e Seep ete ee . 94 1.15 
71 TAQ ES See ae bh eS Ss ees mes Sf ee A ae ms LR . 68 58 
Be heat sy ema le. eek! Wat ida Ae me ant atl A ae Pee 
— | lt i i 2 se = 
Total height. 
| | 

| l l ay 
| 23.36 24.00 24.41 | hey 22.41] 21.66 24.04 21.29 | rae 23.30 
169644 18 



