Chemistry and Physics. 67 
proved: Ist, by oxides “ie chromic acid mick gave acetic 
nd carbonic acids; and 2d, reducing copper oxide with i 
Saccharose also yields’ acetol o this treatment.— Ber. es — 
Ges., xvi, eli April, 18 
e Product of ‘the slow Combustion of Buher. «The 
seiulearly: penetrating odor produced by the slow combustion of 
er has been examined by Lucier. From 150 to 200. c. of 
ether, 25 to 30 c. «. ag the crude product was obtained. This 
exposed for ten days over sulphuric acid gave crystals in rhom- 
bic prisms resembling ice flowers, soluble in water, alcohol, ether 
and chloroform, fosing at 51°, — in ees and ee 
phase in the light of a given seat A reachin nga any poi of 
the diffracted spectrum will never exceed A/4, the di 
remain unaltered, the definition aN the brightness of the spec- 
trum will both be i increased.” With lenses of focal length which | 
are indicated, paintngre shows that a plane grating ruled on 
glass, would in certain cases give more light for oer Pie eck 
than a concave grating. Phil Mag., J une, 1883, 41 
7. Regenerative theory of Solar action.—Under this title ‘Ver 
Ernest H. Coox criti sion ciples theory of solar en ergy. No 
found that it contained staal me same opal ned quantity of 
oxygen as that collected at the same time in Paris, runner 
analyzed the air Solccwd % yh ee and at the bottom of the 
Faulhorn and found the s e proportions of oxygen and nitro- 
ge Frankland has fae: that the composition of air u 
altitudes of 14,000 feet is constant. There is, therefore, no ter- 
restrial evidence of the separation of the constituents of the atmos- 
= which the theory supposes. Again the evidence for the 
t theory deduced from the e composition of meteorites is not conclu- 
Sive. In “certain meteorites a very la arge paar of carbon 
dioxide is Pina eeBE bs larger than exists in our @ tmosphere. 
ssed through an | 
atmosphere very rich in carbon dioxide. F. Mohr has shown that 
