Chemistry and Phystes. : 237 
which the thermometer sank to —20°. The first separation of 
crystals required prolonged cooling; but once effected, it takes 
place much easier and always at the same temperature. That 
temperature at which the first crystals appeared was called the 
freezing point. The fusing point could not be fixed with the 
same exactness. The thermometer was corrected, the specific 
gravity determined on an accurate balance and reduced to 15° by 
Schaeppi’s tables. The Baumé degrees were calculated according to 
the rational arseometer, d = ais The results obtained are 
ve —h 
Siven in the following tabular form :— 
Sp. gr. at 15°. Baumé. Freezing point. Fusing point. 
1-671 58° Liquid at —20° fb 
1691 59° aol eR Ge, 
1-712 60°05° ee 
E127 60°75° 75 — 75° 
1-732 61-0° —85° ome 
1°749 61°8° —0°2 +4°5° 
1767 62°65° +16" +6°5° 
1-790 63°75° +4°5° +8:0° 
1-807 64°45° —9-0° —6-0° 
1°822 65°15° Liquid at —20° aia 
1842 66° ae pees 
F. B. 
- On trating 
Chemical change.—Parrison Muir has suggeste the action o 
Se and red BiOI but in smaller quantity, in the third, The 
town Bil, passes into the red BiOI on standing ; addition of 
Strong HI reproduces brown Bil,.— J. Chem. Soe., xli, 4, Jan. 1882. 
G. F. B 
6. On the Splitting of Petroleum hydrocarbons at low Temper- 
‘tures.—Gustayson has observed that when in hydrocarbons 
obtained either from American or Caucasian petroleum, alumi- 
