Surgery in War.

There are today, roughly speaking, four classes into which current medical literature may be divided: In the first group we may assemble the so-called research papers which deal with theories and phenomena in the field of the medical sciences from the standpoint of their truth or falsity. In a second group we may assemble papers of the nature of case reports, presenting the result of practical experience and, in a growing percentage of cases, justifying the term "clinical research" which has been applied to the type of work they represent. In a third group we find those books and monographs which treat of their subject from the standpoint of the principles involved, omitting detailed analyses, giving a bird's-eye view, so to speak. In the fourth group we find the so-called books of reference, in which great attention is paid to that detail and close analysis which works of the preceding