plane and concave mirror; two eye-pieces ; 1^ in., f in., 

 and ^ in. objectives ; condenser on separate stand ; 

 horizontal mahogany case with leather handle. 



Exhibited by T. Armstrong Bro. .1885. Price 61. 



26. Microscope on tripod stand, with short tube, 

 inclinable ; coarse adjustment by rack and pinion ; fine 

 adjustment by micrometer screw; glass stage, revolving 

 diaphragms ; double mirror. In upright mahogany case 

 with drawer for slides. 



Exhibited by Reynolds and Branson. 1888. Price 41. 4s. 



27. Microscope on tripod stand, with long tube, incli- 

 nable body ; coarse adjustment by rack and pinion ; fine 

 adjustment by micrometer screw ; stage with loose 

 sliding piece to support objects ; revolving diaphragms ; 

 single concave mirror; two eye-pieces; 1 in. objective; 

 condenser on separate stand. 



Exhibited by Newton fy Go. Price (complete) 5L 5s. 



28. Microscope with horse-shoe stand, long tube, in- 

 clinable ; coarse adjustment by rack and pinion ; fine 

 adjustment by micrometer screw ; mechanical stage ; 

 revolving diaphragm ; concave mirror ; one eye-piece ; 

 two objectives ; condenser on separate stand ; brass 

 forceps and live box ; upright mahogany case with 

 drawer for slides. 



Exhibited by Townson and Mercer. 1886. Price SI. 15s. 



29. Microscope on bronzed tripod stand, with long 

 tube, inclinable ; coarse adjustment by rack and pinion ; 

 fine adjustment by micrometer screw ; mechanical stage ; 

 revolving diaphragm ; concave mirror ; two eye-pieces ; 

 1 in. objective ; condenser on separate stand ; live box. 

 Exhibited by Newton fy Co. 1869. Price (complete) 71. 7s. 



30. Microscope with double pillar stand, long tube, in- 

 clinable ; coarse adjustment by rack and pinion ; fine 

 adjustment by micrometer screw ; mechanical stage, with 

 horizontal motion in all directions and also rotating; 

 revolving diaphragm, which, however, has no catch to 

 indicate when it is centred ; plane and concave mirror ; 

 two eye-pieces ; 1 in., ^ in., and J in. objectives ; condenser 

 on separate stand and polarizing apparatus. Used by 

 Messrs. Kerr and "Wallich. Made by J. White, Glasgow. 



Lent by the Government Grant Committee of the Royal 



Society. 1888. 



