256 THE AMERICAN MONTHLY [Sep 
the delineation being accurate, than photography will 
permit. | 
Drawing with a camera lucida is an acquirement which 
calls for a considerable amount of practice, and is not 
successfully undertaken without a large amount of skill 
in the use of the pencil. This condition being fulfilled, 
very beautiful work can be and frequently is done. 
Probably the most generally useful and popular of all 
the camera lucidas is that known as Beale’s neutral tint, 
in which a piece of tinted glass is set at an angle of 45 
degrees to the eye-lens of the microscope, the upper sur- 
face reflecting the image tothe eye. I have a decided 
preference for this pattern, although it suffers from the 
disadvantage of necessitating the microscope being set 
horizontally, and the image is reversed at the top and 
bottom, while the sides remain constant. Still its sim- 
plicity recommends it, and very little acquaintance with 
it enables one to utilize all its capacity. _ 
For many purposes a camera lucida that works with 
the microscope vertically, horizontally, or placed at any 
angle is desirable, and for such the Abbe Camera is gen- 
erally considered the best. The object is drawn as seen 
in the microscope, and, when working, the mirror reflects 
the image of the pencil point and paper on which the 
pencil is tracing, into the apparent field of view. Ihave 
recently been working with Ashe’s Camera Lucida with 
the modifications described by Mr. Scourfield in the 
Journal of the Quekett Microscopical Club for 1900, and 
believe that for many purposes this will be found the 
most practical and convenient pattern of camera. It 
combines the ease of working of the Beale’s neutral tint 
without the transposition of the object and has not the 
disadvantage of bulk possessed by the Abbe Camera. It 
can be used at any angle to which the body of the micro- 
scope may be inclined, from 45 degrees to the horizontal, 
quite comfortably, and by turning it round sideways on 
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