QA 
. © Lastly, the chemist will have daily opportunities 
of experiencing its utility ; and the meteorologist, and. 
the hydrographer, by the use of an accurate and stand- 
ard table of colours, will be enabled, in a much more. 
satisfactory manner than heretofore, to describe the 
skies and meteors of different countries, and the nu- 
merous varieties of colour that occur in the waters of 
the ocean, of lakes and rivers.” 

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Z 
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