9 



adjustment is effected by moving the stage up and down by a 

 rack and pinion. 



6. Goring's " operative aplanic engiscope," 



E. 272. 1877. Given by John Spiller. 



This instrument is an early form of compound microscope 

 mounted upon a ball and socket universal joint. A horizontal 

 arm which bears the body of the microscope slides to and fro 

 on the top of the vertical pillars. There is an oval plane mirror 

 and a 2-inch condenser beneath trie stage. In a separate box 

 are opaque objects, stage forceps, and a stage condenser. 



The instrument is described and figured in Pritchard's 

 "Microscopic Illustrations/' 1830. 



7. Portable microscope, by Dollond, fixed to the 

 bottom of a box, which thus serves as a base for the 

 instrument. Tube shorter than in modern instruments 

 of the English type ; the whole is inclinable. The 

 case contains materials for mounting objects, stage fix- 

 ings, conical diaphragm, Lieberkiibn's reflector, stage 

 forceps, and a live box, consisting of two slips of brass 

 hinged together and provided with holes covered with 

 glass. 



Lent by the late Bennett Woodcroft, F.R.S. 1876. 



8. Old solar projection microscope, with a slide con- 

 taining object glasses of six different powers, live cage, 

 microscopic slides, forceps, and mounting materials. In 

 box. 



Lent by J. Waugh. 1876. 



9. Japanese microscope, consisting of a tubular 

 box 3f in. long by about 1 in. in diameter. The two 

 ends of the box are fitted with two slightly concave 

 lenses, which might do duty as a pair of spectacles. 

 "Within is a small double convex lens about J in. 

 diameter in a leaden frame, which can be placed in a 

 hole on one side of the end of the tube, a pin to support 

 the object being placed opposite to it. 



E. 7. 1859. Given by Capt. Creugh. 



