18 Indian Forest Records. [Vol. IV. 
Number of culms ;put out by a clump. —The actual number of culms put 
out by each clump, as was stated before, varies according to the size and 
age of the clump. In order to fix the rotation on which it is best to cut 
bamboos, it is necessary to know how many stems are put out, on the 
average, each year, by different species. With this object in view 
differentiation was made between under-one-year old and over-one- 
year old culms, when counting bamboo sample plots on the West Coast 
and in Burma. 
By a culm under-one-year old is understood a culm which has 
not gone through two monsoons. By an over-one-year old culm is 
understood a stem which came into existence during one monsoon and 
which has passed through a second rainy season. 
The prevailing species of bamboo on the West Coast is Bambusa 
arundinacea. Of this species, the number of new stems counted was 2,675 
against 9,160 old ones or in the proportion of one new stem to every 3'42 
old ones. 
In the Pegu Yomas, in Lower Burma, two of the commonest species 
are Tinwa ( Cephalostachyum pergracile) and Kyathaung ( Bambusa poly - 
morpha). Of the former, 4,047 new culms were counted in the sample 
plots against 11,870 old ones or in the proportion of one new culm to 
every 2 93 old ones. Of the latter, 4,881 new culms were counted against 
20,633 old ones, or in proportion of one new culm to 4 22 old ones. 
The question of the proportion of new to old culms will again be dealt 
with when the rotation, on which the felling cycle for bamboos should 
be fixed, comes under discussion. 
It has been explained above that the number of new culms put out 
per clump depends on the size and strength of the clump during any 
given period of its life. In order to collect definite data on this point 
Mr. Buchanan, a Forest Officer in Upper Burma, carried out careful 
countings in two successive years in sample plots chosen by him in 
average bamboo forest. The following table gives the results of his 
experiments :— 
[ 176 ] 
