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maximum of amylum an hour before sunset or earlier. The 
difference between transmission and production grows contin- 
ually smaller and finally falls to zero. 
This equilibrium continues in some plants tested, but does 
this supply that during this period no organic matter is gen- 
erated? Certainly not. The quantities actually originated remain 
quite latent. An hour or so before sunset the transmission 
again becomes greater than the assimilation, while at sunset 
the assimilation stops altogether and the transmission goes on, 
though slowly only. Such is the succession of phenomena on 
bright days, but as soon as the weather is disturbed, the 
quantity of the remainder is at once affected. Thus, I have 
already stated, Delima-leaves contain more amylum on a dull 
afternoon than on a sunny one. 
Both processes, assimilation as well as transmission are of 
course weakened , but according to the observations made, the 
latter to a less degree. Direct experiments with Connarus show 
that the overproduction by leaves when exposed to the full 
sun, is smaller in the afternoon than in the morning. Also 
the slow increase of the amylum in low plants such as Coca, 
and the fact of the maximum being arrived at long before 
sunset, naturally suggests the question: does the energy of 
assimilation grow smaller or the transmission greater after 12, 
or do perhaps both processes become slower, but in different 
degrees? To this question no positive answer can be given. It 
is just possible that the hygroscopic condition of the atmos- 
phere which during the West-monsoon when I made my ob- 
servations, is apt to change to such a degree in the afternoon 
that a tropic downpour is the result, to a certain extent in- 
fluences the chemical rays. Who shall say, besides, in what 
way the quantity of water contained in the cells is modified, 
and how in this way the power of assimilation is affected! 
On the other hand we are not sufficiently acquainted with 
the circumstances under which the removal of the assimilated 
matter goes on quickest. Is it proportionate to the temperature 
and has the light nothing to do with it? 
