2 - more feeble than at other times of the year. Hen 
336 BOTANICAL GAZETTE . [war 
Pinus Thunbergit. 
Two pot-plants were used, each about half a meter high. On 
February I starch-contents of the leaves from both plants were 
examined and treated as below: 
Starch-content Treatment 
? Covered with a black cylinder. 
B. 3 ? Check plant not covered. 
The two put out of doors side by side. 
On February 20 the starch had disappeared from A, and that _ 
of B had remained constant. At noon of the same day 4 was 
exposed to light, and at 5 p. M. the starch-contents were found to 
be 1-2, having been formed within five hours. : 
Abies firma. 
Two pot-plants, each about a meter high, were examined for 
the leaf starch on January 23 and treated as follows: 
Starch-content Treatment 
A. 2-3 _ I Put into the dark room. 
B. 2-3 +2-3 +I Remained out of doors as a check. 
. At g A.M., February 10, the mesophyll of 4 was found to 
entirely free from starch. After exposure to the light | 
doors, at 5 Pp. M. of the same day the starch was I-2,! 1-2, ]; and 
at 5 Pp. M., February 11, the starch had increased to 3, 3 1 
- In addition to these plants, several leaves of the 
trees, which contain some starch in the mesophyll, were 
with tinfoil in the beginning of February: 7) hea j 
_ cus Vibrayeana, Sciadopitys verticillata, Osman 
Tlex integra. After two or three weeks the leaves were f 
be entirely free from starch. ee 
_ These experiments suffice to prove that many ofthe € 
green plants in Tokyo can form starch in the leaves: b : 
‘synthesis, and translocate it to other parts of the - 
during the winter, though these processes may of course be 
_ found in many evergreen leaves in winter may be Oe 
_ that which i is formed during that season by a 
