Analyses of Books . 
1883.] 
747 
soda, powdered flints, and copper,” — which mixture would, of 
course, yield a silicate of copper. 
Among the adulterations of ultramarine, sugar might have 
been mentioned as added by some Austrian manufacturers. 
Concerning Persian red we are unable to agree with the author. 
He describes it as a chromate of lead, or in other case a red ob- 
tained from ochres. We have always heard the names Persian 
red, mineral lake, pink colour, and lacque minerale applied to 
stannates of chrome, the preparation of which may be found in 
Gentele, and which are much more permanent than the chromates 
of lead. 
“ Crimson lake,” we read, “ is an extract from the Coccus cacti 
insect fixed to oxide of iron or alumina.” An almost infinitesi- 
mal quantity of oxide of iron is enough to destroy the beauty 
either of the cochineal or the madder-lakes. 
A few typographical errors may be pointed out for rectification 
in a future edition. Thus in one passage we find “ cromate ” of 
potash for chromate ; elsewhere “ patassic ” nitrate for potassic ; 
“Jeune” minerale for Jaune, &c. 
In some cases also the author makes use of expressions liable 
to occasion misunderstanding. Thus he states that “ Iodine 
Scarlet ” is composed of 200 equivalents of mercury and 254 
equivalents of iodine.” “ Parts ” would be the correct expression, 
the word used giving a quite erroneous notion of the composition 
of the pigment. 
As a whole, however, we consider that these tables will prove 
of great value. The price at which they are offered is remark- 
ably low, so as to bring them within the reach of all persons 
interested in the practical application of pigments. 
The Mason College Magazine. Vol. I., No. 8. November, 1883. 
Birmingham : Cornish Bros. 
This little monthly goes on presenting its readers with not a 
little matter suggestive of wholesome thought. 
We first notice an able paper on the “ Study of Modern 
Languages.” The author remarks that “ we may claim for lin- 
guistic studies that they teach us to know ourselves nationally; 
to distinguish between the nation of philosophers, the nation of 
‘ bels esprits,’ and the nation whose devotion to the industrial 
arts has won for it the name of a ‘ nation of shopkeepers.’ ” It 
might be added that this sneer comes with scant grace either 
from the philosophers or the bels esprits, since they have deve- 
loped such a vehement desire to insinuate themselves behind 
our counter. 
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