OF RADIANT HEAT THROUGH DIFFERENT BODIES. 29 
TaBLeE I[.—continued. 
Deviations of Rays 
the galvanometer. _ transmitted. 
Nitric acid (pure and colourless) ...... 5°36 TS 
Alcohol (absolute and colourless) ...... 5°30 15 
Hydrate of potassium (colourless) ...... 4°63 i3 
Acetic acid (rectified, colourless) ...... 4°25 12 
Pyroligneous acid (of a slightly brown- 
ish colour)........ 4°28 12 
Sugared water [ean sucrée] (colourless) 4°20 12 
Alum water (colourless) .............0200 4°16 12 
Salt water (colourless)* ..... ore 4°15 12 
White of eggs eae yellowish) . digs 4-00 11 
Distilled water . pane 3°80 11 
Tas eE II.—Crystallized bodies. Common thickness 2™-62. 
Deviations of Rays 
the galvanometer. transmitted. 
MPD occ r cot scacecSccghe ccc estase 21-60 62 
Rock salt (diaphanous) . eevceaees 28°46 92 
Iceland spar (diaphanous) ., Meet tae 21°80 62 
Another species (diaphanous)............ 21°30 61 
Rock crystal, colourless (diaphanous)... 21°64 62 
Rock crystal, smoky (diaphanous and 
very decidedly brown)... 20°25 57 
Brazil topaz, colourless (diaphanous) ... 19°18 54: 
Carbonate of lead (diaphanous) ......... 18°35 52 
White agate (translucid) ... 12°48 35 
Sulphate of barytes (veined, ‘dully dia- 
phanous) . 11°72 33 
Emerald (diaphanous, ofa alight plue)... 10°16 29 
Yellow agate (translucid, yellow) ...... 10°10 29 
Borate of soda (translucid) .............. 9°87 28 
Green tourmaline (diaphanous, Soda 9°54 27 
Adularia (diaphanous, dull, veined) . 8°30 24 
Sulphate of lime (diaphanous) Se re 715 20 
Fluate of lime (diaphanous, dull, veined) 5°40 15 
Citric acid (diaphanous) ...............64 515 15 
Sardoine (translucid) ...............+.-0- 4°98 14 
Carbonate of ammonia (diaphanous, dull, 
striated) ... 4°50 13 
Tartrate of potash and soda (diaphanous) 4°40 12 
Alum, crystal (diaphanous)... 4°36 12 
Sulphate of Sasa (strongly diaphanous, 
blue) ... 0:00 0 
* In this solution we used very diaphanous pieces of rock salt; the same may 
be said of the solution immediately ey ce water was. completely satu- 
rated with the alum. 
