Reviews 
185 
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quently troublesome to locate a compound. Seidell has intro- 
duced a large number of important organic substances, the 
selection of inorganic compounds is more satisfactory, the 
arrangement is logical throughout, and the determinations 
are more reliable. Greater reliability was arrived at with 
much labor by recalculating the various determinations to a 
common basis and drawing curves through the points plot- 
ted. Selections were then made after comparing the curves 
and studying the methods of determination. An index adds 
to the value of the book. Every chemist should have access 
to this thoroughly satisfactory dictionary, in fact it should 
be in every working scientific library. A. S. W. 
