Chemistry and Physics. 429 
This is a colorless liquid, having an aromatic odor, and boiling at 210°. 
With caustic potash it yields acetic acid, and the alcohol.—Ann. der 
Chemie und Pharmacie, \xxxviii, 129, October, 1853. 
1 ormalion of nitruret of benzoyl from hippuric acid.—Lim- 
PRicut and von Ustar have found that when hippuric acid is heated 
in a tubulated retort, the acid fuses at 130°, gives off a little benzoic 
acid at 210°, and boils at 240°. The only volatile products of this dis- 
tillation are benzoic acid, colored faintly red, traces of prussic acid, 
anda liquid which proves to be nitruret of benzoyl, CisHsN. The 
constitution and properties of this body correspond perfectly with those 
of the nitruret obtained by Fehling by the distillation of benzoate 
of ammonia.—Ann. der Chemie und Pharmacie, |xxxviii, 133. 
W. G. 
dinary flint glass prisms ; by Ocpen N. Roov.—Herschel in his treatise 
ines in 
sessed of a prism of even comparable flint glass, | was led ‘to try what 
could be done with articles of poorer quality. Two flint glass prisms 
having angles of 60°—such as are ordinarily sold by opticians, and 
diameter, through which sunlight was admitted ; the room not being 
darkene n this manner about twelve or fifieen lines could plainly 
seen by the ~haked eye: the principal of these were D in the or- 
trum should rather be expanded. 
onD Senses, Vol. XVII, No. 51.—May, 1854. 55 
