49 



Besides this, the leaves of several trees and shrubs, which contain 

 i Bt rch i th i esophyll, were covered with tin-foil and the disap- 

 pearance of starch from those leaves was very clearly observed after some 

 days. Then these starch-less leaves were again exposed to light and the 

 reformation of starch was observed to take place. 



SUMMARY. 



The starch o-ntents of ever-green leaves dilfer at a given time much 

 by the species of plants. Monocotyledons generally contain less starch than 



the end of November, reaching 'its minimum with the end of January and 

 increases again from the end of February. 



Many ever-green leaves in Tokyo and other localities of middle and 

 southern Japan, contain more or less starch in the meaophyll, while it is 



This staivh is funned by the carl) >n assimilation in that season i.e., 



feebly, together with its translocation within the plant-body. 



Starch of the stomatie guard-cells becomes less or even entirely dis- 

 appears in many species of plants, while some few species contain pretty 

 rich amount through the winter. 



Many ever-green leaves in the northern part of Japan mostly lose the 

 starch from the mesophyll and gnard-cells of stomata in the winter, while 

 a very little starch is still retained in some few species. 



The starch contents of ever-green leaves are generally richer in spring 

 than in late summer or early autumn. 



The entire absence of calcium oxalate crystals from the leaves in 

 winter as stated by Lidforss could not be verified in my investigation. 



Botanical Institute, Imperial University, Tokyo. 



Mo. Bot. Garden. 

 £901. 



