John VanSickle nous illumina en ce 2008-09-13 23:30 -->
> Jim Holsenback wrote:
>> Howdy,
>>
>> Yikes ..... summer just didn't seem long enough. Last evening temp got 
>> down to 3.8C and the Canada geese are on the move. We've had a REALLY 
>> damp summer so maybe the fall colors will give us some extra eye candy.
> 
> You get extra fall colors from lots of sugar (glucose, really) in the 
> leaves just as they die for the winter.  You get lots of glucose in the 
> leaves from lots of sunlight.
> 
> If it's not sunny when the leaves start their annual change, they won't 
> be too colorful.
> 
> Regards,
> John
The fall leaves colour also depend on the mineral salts present in them.

-- 
Alain
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Zen Buddhism: Shit is, and is not.

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