MICROSCOPE LAMPS. 



may be pressed, a property of considerable value to public 

 exhibitors. 



Another very useful accessory is the revolving table, 

 several forms of which are now sold at a very cheap rate. 

 At one time the cheapest which could be obtained was 

 about 9/., and now they may be procured (with a slate top) 

 for less than one-fourth of that sum. 



When two or more microscopists are pursuing any 

 investigation together, the constant rising from chairs must 

 often have been thought 

 a nuisance, but a cheap 

 revolving table enables 

 mutual observations to 

 be made with comfort. 

 The author's revolving 

 table is 2 feet 4 inches 

 in diameter, the top of it 

 is 2 feet 3 inches from the 

 ground, and four or even 

 six observers may com- 

 fortably sit round it. 



And now a few words 

 as to illuminating ap- 

 paratus. The best light 

 which can be obtained 

 is that from a good white 

 cloud on a sunny day, 

 but unfortunately in our 

 towns and crowded cities 

 we get but little sun- 

 light undiluted with smoke, and students generally are 

 occupied the day through, so that it becomes necessary to 

 use artificial light. 



When using light from the sky or from the sun, it should 



FIG. 81. 



