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13.

now in process of preservation. Recent researches in bacteriology having made it appear necessary that a most thorough and painstaking revision of the entire field of Hygiene should be made, a [[gallaxy?]] of some the most celebrated and distinguished hygienists of Germany have combined, each in his own specialty to accomplish this end. Their names, in my opinion, warrant that the undertaking will be a success in more than one respect.
The volume under immediate consideration treats of the soil, its physical and chemical characteristics, their dependencies, the relations which they bear to human health and the changes, either natural or artificial which tend to make the soil either a means for the prevention of disease or, on the other hand, tend to endanger human existence. It treats of the interchanges which take place constantly and which must take place between the constituents of the soil and