336 C.M. Warren on a Process of Fractional Condensation. 
safety-lamp. This process was still going on, the lamp being 
highly-heated from the excess of fuel thus added to it, but no 
ing-points. 
Notwithstanding the precautions taken to avoid loss from 
come over between <ertain temperatures; as, for example, 
o0" C.; between 50° and 100°, etc.; from these data one may 
judge pretty nearly of the quantity which it will be advisable 
to take. It is evident that, when very volatile bodies are pres 
nt, even in considerable proportion, a much Jarger quantity 
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