ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
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(class 3) is figured in Rees’ Cyclopaedia, 1819, and called “Benjamin 
Martin’s Microscope ” ; but it is liigbly probable that this is only a trade 
term ; for we have no other evidence that Benjamin Martin adopted this 
construction. Benjamin Martin died in 1782, and the late and finest 
example |of his work which is in the collection of the Society, is of 
class 2. This Microscope, whose probable date is about 1785-95, is the 
earliest type we have of class 3, which is that of the modern Microscope. 
Fig. 72. 
A second Microscope (fig. 73) has been very kindly presented by 
Dr. Dallinger. It is of class 2, and conforms very closely to a model 
made by Benjamin Martin in 1776. Unfortunately it is not signed, but 
the workmanship of the Microscope is evidently of that period, and might 
well be Martin’s work. It will be seen at once that we have here a model 
of some importance ; for it will be noticed that it is a body 'focusser, in 
contradistinction to the stage focussers so prevalent at that date. The 
following is a brief description : — The pillar is hinged at the bottom to 
a folding tripod ; a tube can be extended out of this pillar for about 
an inch by means of rackwork ; from this rack tube a third one may be 
