~’* 
” 
422 Miscellaneous Bibliography. 
oo. the Paar ane Rt and the rare — thus set ae in 
e prefac “ Onze s passées 4 Mulhouse comme professeur de 
chi pare et appliquée, ‘ot comme ditectour an laboratoire eneign 
n’ont permis de réunir les éléments de ce traité. 
wists Industrielle, toujours préte a fixer son attention sur tout ce qui est 
réellement utile, a bien voulu s’interesser au projet de ce travail, et 
m’offrir le concours effectif de ses Jumiéres. La plupart des articles du 
sain volume et une vie de ceux du second ont été lus et discutés 
enséance du Comité de chim f 
We rejoice that it is no “a necessary to plead total ignorance when : 
asked to recommend good, live books on tinctorial science and art. The 
technological student and the enlightened practical man may here find a 
really standard, recent work on the subject. It is ai that the scientific 
might des 
largely in practical printing, and yet one may search books long and 
almost in vain to find any tolerable account of their actual composition 
and mode of manufacture. If we examine the articles in the market 
that work best, we find that the arseniate is not the salt known to chem- 
ists by that name, but an anhydrous arseniate neutral to litmus and con- 
taining three equivalents of soda to two equivalents of arsenic acid; that 
the silicate is not the normal salt, but an indefinite waterglass combining 
one equivalent of soda with from two to three equivalents of silica ; that 
e stannate contains a considerable excess of caustic alkali. For want. 
of accurate knowledge on this last matter, a large establishment that we 
know of formerly lost several thousand dollars a year by persevering in 
a vicious mode of manufacturing the stannate, whereby only one-half of 
the tin used was obtained in solution. 
o— reader, serviceable to the student, and handy for a of 
to the profe nomer, Especial — were taken to emia 
the | latest information on all branches of the science. 
The work is profusely illustrated, and x sty is made quite attractive 
for popular reading. Notwithstanding the great difficulty of repre 
ing such delicate objects as comets and nebule by wood-cuts, the art 
