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POPULAR SCIENCE REVIEW. 
metals are described in an order consistent with the arrangement of the 
more typical elements. 
The formulae used are substantially those employed in the last edition, 
and wherever the constitutional formulae suggested by Dr. Frankland are 
introduced, they are enclosed within square brackets to indicate that they 
are an interpolation in the original work. The whole bears evidence of 
careful revision, and many additions, particularly in the portions devoted 
to the non-metallic elements, have been made. The metallurgy of all the 
more important metals is described with sufficient detail to afford general 
ideas of the various processes employed ; but in the case of iron, the 
production of which gives rise to one of our most important technical 
industries, its metallurgy is given with considerable detail. Sections are 
introduced on the recently discovered metals, gallium and davyum ; a 
copious index has been supplied, and every care appears to have been taken, 
not only to insure great accuracy, but also to render the information 
furnished readily available. 
This work can be equally recommended to the beginner and to the advanced 
student of chemistry, since whilst it leads the former over a judiciously 
traced route to an acquaintance with that science, it at the same time affords 
the latter a well-arranged and reliable book of reference. 
