114 
LOCK : ECOLOGICAL NOTES 
’L.. is the long-styled and S. the short-styled plant. Ov. 
denotes the total number of flowers which had fallen from 
each branch, leaving the ovary either shrivelled or swollen, 
and Ca. denotes the swollen ovaries. 1 is the main stem of 
the plant ; 2, 3, &c., lateral branches counting from below 
upwards. It appears from the above that 95 per cent, of 
flowers of the long-styled form were in a condition to set seed, 
as compared with only 13 per cent* of the short-styled* Rain 
fell on twenty-seven days of September and on only seventeen 
in May ; and although the rainfall for the two months was 
nearly equal (12*33 inches in May and 1T36 inches in Sep¬ 
tember), yet the weather in September appeared distinctly 
less favourable for the flowers than that in May. And it is 
possible that this may partly account for the different result 
in the two months, for I have found the productiveness 
of other plants to vary greatly at Peradeniya according to the 
time of year at which the seeds were sown. Further, the 
plants examined in May were much older than those observed 
in September, which were only five months old. 
Self-sterility ,—Experiments in artificial pollination were 
begun with a view to comparing the offspring of legitimate 
and illegitimate fertilization. This object was not attained 
owing to the fact that the plants appear completely self-sterile, 
and that illegitimate pollination between separate plants was 
found to be equally ineffective. It has already been shown 
that the offspring of legitimate pollination consists of the two 
forms in about equal numbers, since if illegitimate pollination 
produces no seed the seed arising from insect pollination 
must be the result of legitimate fertilization. Brief details 
of the experiments which led to the conclusion that only 
legitimate pollination is effectual may be of interest. 
The experiments were carried out in May and June. In 
every case the visits of insects were excluded by the use of 
parchment paper bags, which were wired on to the branches. 
In the first place, thirteen flowering branches of the long- 
styled form and nine of the short-styled were completely 
