356 APPARATUS REQUIRED 



APPARATUS REQUIRED IN MICROSCOPICAL 

 INVESTIGATION. 



1. The Microscope. 



NECESSARY. ADVANTAGEOUS. 



1. Microscope with large stage, firm tripod Large microscope pro- 



stand, coarse and fine adjustments, vided with moveable 



double mirror, and arrangement for stage and all the 



inclining body ; generally termed the modern improve- 



Studenfs Microscope. 15, pis. II, ments. 16. 

 Ill, IV. 



The student's microscope with two powers With two powers, this 



and bull's-eye condenser costs from five to instrument costs from 20 



ten guineas. to 30 guineas. 



2. Pocket Clinical or Field Microscope, Binocular microscope. 



in case, with pipettes, test tubes, &c. 17, pi. VI. 

 20. 



3. Object-glasses. i. 77/6' inch magnifying Two-inch object-glass. 



from 30 to 40 diameters, the glasses 6. 



of which can be removed one by one, Eighth of an inch. 



so that lower powers can be obtained. Twelfth of an inch. 



2. The quarter of an inch magnifying Twenty -fifth. 

 about 200 diameters. These glasses 

 should define well, the field should be 

 perfectly flat and free from coloured 

 fringes, and they should admit a suffi- 

 cient amount of light. 6, pi. I, figs. 

 7,8. 



II. Accessory Apparatus. 



4. Diaphragm plate. 14, 36, pi. I, Gilletfs achromatic con- 



fig. 9. denser. 38. 



5. Bull's-eye condenser. 27, pi. XI, figs. Polariscope. 23, 



51, 52. pi. XIII, figs. 57, 58. 



6. Universal condenser. Spot glass. 3 3, pi. XI I. 



% 55- 



