38 WOGG, ON OPHTHALMOSCOPIC SURGERY. 
A Manual of Ophthalmoscopic Surgery. By Januz Hoge. 
London: Churchills. 
Mr. Hoge was one of the earliest English writers on the 
advantages and uses of the ophthalmoscope, and his work on 
the application of that instrument to diseases of the eye 
has deservedly reached a third edition. It does not come 
within our scope to criticise a work like this, but we cannot 
forbear our commendation of those portions of Mr. Hogg’s 
work which treat of the microscopic structure of the eye. 
Whatever value the ophthalmoscope possesses as an instru- 
ment which enables the surgeon to look quite into the 
interior of the eye, there can be no doubt that the value of 
this instrument has been greatly enhanced by the light which 
microscopic investigation has thrown upon the minute struc- 
tures of the eye. Nay, more, we believe that those who have 
been best trained to observe with the microscope will be 
found most competent to use the ophthalmoscope. Both 
instruments, in fact, involve the same general principles of 
optics, and by both the observing eye is helped to obtain a 
more accurate knowledge of the thing observed. It is very 
evident, from the way in which Mr. Hogg has treated his 
subject in the introductory chapters, that he has approached 
the study of the ophthalmoscope with that knowledge of 
optical principles that peculiarly fits him to be an instructor 
in the art of using this instrument, and we have no hesitation 
in recommending his work to all those who are anxious to 
master the important art of distinguishing the various forms 
of disease that are indicated by the state of the interior of 
the eye. The work is illustrated with a series of chromo- 
lithographs of diseased conditions of the interior of the eye, 
and also woodcuts representing the microscopic structure of 
the liquids of the eye. 
