> As for coloration and latitude/altitude changes, might try Alpatov for 
> some reading, or even old Bergmann and his famous Rule!

I'm not familiar with thes people, and I doubt their work is easy for me to 
find. Could you kindly outline where/when each wrote, whether their work has 
been corroborated by later writers, and, in a nutshell, what they found?

Thanks.

allen 

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