20 HOW TO USE THE MICROSCOPE 



magnification 28 diameters, run the cost up to £2. 

 Or, instead of the 2-inch objective, a combining 

 object glass, giving with eye-piece 30 to 60 diameter 

 power, is suppHed, making the price £2 3s. 6d. 

 Other eye-pieces and objectives can be added as 

 desired. The instrument is compact in its case, and 

 is easily carried, making it suitable for conveyance 

 on a hohday. It is adapted for a great variety of uses. 



Fig, 7. — Williams' "Wonder" Microscope. 



Messrs. A. Williams and Co., Wood Green, 

 London, make a speciality of their "Wonder "micro- 

 scope. This has a lightly made but firm stand 

 (see Fig. 7), with raok-and-piDion coarse adjust- 

 ment, operated by two milled heads. It is remark- 

 ably cheap and yet efficient. Supplied in neat 

 poUshed mahogany case, together with one objec- 

 tive, an eye-piece, brass forceps, and a live cage, 

 it costs £2 7s. 6d. The same firm make a series of 

 achromatic objectives, which sell at 10s. 6d. each. 



