152 Scientific Intelligence. 
product, which the gas-manager was puzzled to dispose of. We 
quite well recall the time when it was taken out to the open sea 
and the casks containing it were thrown overboard for the want 
of any better use to be made of it. The researches of Hoffmann 
and Mansfeld (1845-47) on the light oils of coal tar and the 
covery of many new hydrocarbons. Dr. Lunge’s treatise is a 
model of what such a work should be. He handles the subject 
rated. e not encumber his book with the transformations 
and deviations of these products, that being the special work of 
the chemical manufacturer, The is profusely illustrated by 
wor 
excellent wood-cuts, mostly to scale, of all the newest and best 
forms of apparatus in use in the business of the distiller of coal- 
tar products and the treatment of ammoniacal liquors. The 
on the nature and origin of jointed structure. The rocks eX- 
amined are mainly dolomites and pure or argillaceous limestones, 
iointi wo classes of 
