ZOOLOGY AND BOTANY, MICROSCOPY, ETC; 
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arrangement for changing the power ; fourthly, it is the first Microscope 
patented. The date of the patent is 1743 ; but the inventor states that 
he designed and made it in 1728. If this earlier date could be estab- 
lished, it would be the earliest known instance of an English Micro- 
scope with a mirror. The Royal Microscopical Society possesses an 
excellent example of this Microscope, dated 1742. and numbered 22. 
Fig. 40. 
1744. Cuff’s Microscope (fig. 43). The post A B is fixed to a 
square box foot, and the stage is fixed to this post. The bar behind 
and parallel to the post, to which the limb D carrying the body is 
attached, slides in the socket B. The thumb-screw in front clamps C, 
which is fixed to the movable bar, to the post A. The method of focus- 
sing is therefore simple and effective. The thumb-screw is loosened 
