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SCIENTIFIC MEMOIRS. 
VOL. III.—PART XII. 
ARTICLE XXI. 
_ Proposal of a new Nomenclature for the Science of Calorific ' 
Radiations. By M. Mewuont. 
[From the Bibliotheque Universelle de Genéve, No. 70, for October 1841. ] 
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7 HE differences lately discovered between the immediate pass- 
age of caloric and of light through solid and liquid media, in- 
_ duced me some years ago to propose certain expressions designed 
_ to classify the new properties, and to distinguish them clearly 
from those which relate to the faculty of transmitting or of inter- 
cepting the luminous rays. Further progress has since showed 
that the force to which we must attribute the absorption of heat 
by transparent media did not act in the same way upon radia- 
tions of different origin ; and that the emergent radiations of the 
_ media permeable to Bens freely traversed certain kinds of screens, 
themselves permeable to other calorific radiations. This conse- 
quence was the result, that radiant heat was composed of differ- 
ent elements, and that a certain number of these elements existed 
in a greater or less proportion in the radiation from each source. 
‘All these rays passed, notwithstanding, abundantly and in the 
me proportion through a certain solid substance; and all the 
‘media which gave different calorific transmissions lost their dif- 
ential property, and became entirely analogous to the sub- 
stance of equal transmissibility when they were reduced to very 
thin slices. Thence, in my opinion, the conclusion that there is 
a@ perfect analogy between calorific transmission through colour- 
| less bodies, such us water or glass, and the transmission of light 
through coloured media. It was therefore necessary to have re- 
rse to other denominations, in order not to confound together 
; on two kinds of action. 
| vou. 11. PART xIt. 2N 
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