Second Class Microscope Stands.— Nos. 3 & 4. 



£ s. a. 



No. 3. Best Student's Microscope, with uprights and joints, 

 quick and slow motions to body, graduated sliding 

 tube, and two eye-pieces ; thin stage, with vertical 

 and horizontal actions by rackwork, sliding and re- 

 volving planes, and spring clamping piece ; dia- 

 phragm with revolving and removeable fittings; 

 double mirror, with lengthening arm ; pliers, 

 forceps, and two glass plates 12 12 



No. 3. Best Student's Microscope, the same as above, but 

 with plain stage, consisting of sliding piece and 



clamping spring 8 8 



Upright Case for No. 3 Stand in Honduras mahogany, 



with box for apparatus 2 10 



Strong flat case for ditto in Honduras, dovetailed ... 1 5 



No. 4. Smaller Student's Microscope, with quick and slow 

 motions to body, one eye-piece, sliding tube, stage 

 with sliding piece and clamping spring, revolving 

 and removeable diaphragm, single concave mirror, 

 pliers, forceps, glass plate and mahogany case 5 10 



Apparatus to Nos. 3 & 4 Stands. 



No. 3 Eye-piece for No. 3 or 4 Stand 15 



Indicator to No. 1 Eye-piece 5 



do. No. 2 do 5 



do. No. 3 do 5 



Achromatic Condenser of two powers, 60° and 20° of aper- 

 ture, rackwork and adjustment to brasswork 3 



Achromatic Condenser as above, with sliding fitting, and no 



adjustment to brasswork 2 5 



Achromatic Condenser, Lenses of 1 10 



Nachet's Prism for oblique light 18 



Wenham's Parabolic Reflector, with adjusting stop 2 10 



Polarizing Apparatus of* two Nicol's Prisms, with revolving 



fittings, and one plate of selenite 2 10 



Two Double Image Prisms and Selenite Film, with fittings 



to Eye-piece, and brass plate with holes 2 2 



Crystals to show rings round the optic axis and fitted to 



Eye-piece each from 10 6 



Tourmalines from 10 



Darker 's Selenite Stage 2 2 



