FOR THE SCIENCE OF CALORIFIC RADIATIONS. 535 
eemario and Etymological View of the New Nomenclature of 
Radiant Caloric. 
Thermochroology (from Geppos warm, [heat] xpoa colour, chan- 
. ging the a into 0, and Noyos discourse), doctrine 
of coloured heat, and, according to us, science 
of radiant heat; 1st, because it is only radiant 
heat which is imposed of different elements, 
quite analogous to the coloured rays of light; 
| 2nd, because white heat does not exist at the 
a surface of the earth ; 3rd, because the colour of 
be. heat not ouly indicates the radiant form and the 
heterogeneity of the elementary pencils (jile¢s), 
but also because this phrase constantly brings 
i to mind the supposition of a particular colora- 
4 tion, quite distinct from ordinary coloration; a 
e Supposition which comprises all the properties 
ts newly discovered in bodies with regard to calo- 
rific radiations 
Be ierrasy (from Oepudw to heat,and dua through, across), trans- 
. calescence, or calorific transparency of bodies. 
Adiathermasy (from a priv., and da8eppacia transcalescence), 
calorific opacity. 
Be tthermic (from 80a through, and Geppos warm [heat]), transca- 
ee lescent, diaphanous for heat. 
_ Adiathermic (from a priv., and dvaBeppuxos transcalescent), desti- 
tute of calorific transparency, opake for heat. 
. Thermochrosis (from Beppos warm, [heat] and ypoa colour; whence 
¥ xpow to colour, and ypacts coloration), colo- 
ration of heat. 
Thermochroic (from Oepyos warm, [heat] and ypoa colour), coloured 
it. for heat. 
Athermochroic (from a priv., and Oepyoypoixds coloured for heat), 
without calorific colour, colourless for heat. 
_Melanothermic (from pédas, gen. wédavos black, and Geppos warm 
[heat]), that which is black for heat, because it 
absorbs nearly all the incident heat, and thus 
acts on the calorific rays as black bodies do 
with regard to light. 
Leucothermic (from devxos white, and Oeppos warm [heat]), white 
for heat, because its property is to diffuse or 
4 
disperse every kind of calorific radiation with 
