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that form presents it to men of science, 
trusting, that by removing the present 
ambiguity in the names of colours, this 
Nomenclature will be found a most use- 
ful acquisition to the arts and sciences. 
SINCE the former edition of this Work 
was published, Professor Jameson, in his 
« 'Treatise on the External Characters of 
Minerals,” makes the following observa- 
tions. 
“ Many attempts have been made to delineate the 
different colours that occur in the Mineral Kingdom, 
with the view of enabling those who do not possess a 
mineralogical collection, or who may not be familiar 

