ee it a i gis re eee ee ES aoe 
Lae : = ae Seth : Tee a : is ee Fo) 
= ay as yet be rega 
_ ™ consequence of the imperfection of 
actual experimental dem , 
a Vue Ce 
Silliman and Wurtz on Flame Temperatures. 839 
Another density determination gave a considerably higher 
figure; but, wishing not to exhaust all my material, Thee not 
repeated it, but have adopted 0-7. Calculation gives 0°7048, 
assuming the three volumes of unknown illuminants to have 
a density of 1°5. 
With regard to these three volumes per cent of illuminant 
hydrocarbons; as they are absorbed by Nordhausen acid they 
according to Fouque and Gorceix in the gases of the Appe- 
nines; in most cases in traces only, but in one case to the ex- 
me confident of this; but as important chemical and geological 
Conclusions are here involved I shall make further and repeated 
of this point. 
SS acer ee TS 
Arr. XXXVI—On Flame Temperatures, in their relations to 
Composition and Luminosity; by B. SrzLIMAN and HENRY 
Worrz. Firsr Parr. 
Read to the American Association at Salem, August, 1869. 
1. Calorific powers or effects of gases.—The calorific powers or 
effects of ‘ies foe: in ae belief, at the very basis the true 
- tical bearings that can scarcely be overrated. In fi 
studies of the subject have led us in the direction of ue Brae 
tal conclusion that, all other conditions being eq 
in a given — the m 
