ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
675 
being put earlier than about 1765. Below the stage is a short piece of 
conical tube, and below that is a wheel of graduated diaphragms. This 
conical tube is a survival of the black ivory cone, mentioned by Henry 
Baker in his description of Culpeper and Scarlet’s Microscope in 1743. 
An interesting point is that there is no known instance of a wheel 
of graduated diaphragms between the years 1702 and the establishment 
of achromatism 1825-30 ; so that if the date of this Microscope could 
be established prior to 1825, it would be the earliest example of the 
reintroduction of the wheel of graduated diaphragms since 1702. 
Microscope by John Cuff. — The President exhibited au interesting 
old Microscope by J. Cuff of Fleet Street (fig. 117), which in its day 
Fig. 117. 
(1) A compound body having a single eye-lens (no field-lens) can bo 
attached. 
(2) It is provided with a fine adjustment of the John Marshall type 
(lens and not stage focussing). 
(3) The stage has lateral movement on a pivot. 
(4) The instrument is inclinable. 
(5) The pillar is mounted excentrioally on its oval base-plate, and it 
is capable of rotation, which gives the Microscope greater stability in 
different positions. 
(6) It can be folded up for portability. 
(7) A clip is provided to clamp the slide to the stage, and this is 
