58 



THIRD-CLASS MICROSCOPES. 



want of experience in its use, is avoided ; whilst the inferior in- 

 strument will still be found serviceable for many purposes, after a 

 better one has been acquired. 



41. Fields Educational Microscope. — This instrument (Fig. 31) 

 is known as the ' Society of Arts Microscope,' in consequence of its 

 having gained the medal awarded by that society in 1855 (at the 

 suggestion of the Author) for the best three-guinea Compound 

 Microscope. This award must be understood, not as a guarantee 



Fig. 31. 



Field's "Society of Arts" Compound Microscope. 



for the perfection of its construction, but as marking the highest 

 degree of excellence among the instruments sent in competition, 

 that seemed consistent with the cheapness* which was the funda- 



* This instrument is furnished with two Eye-pieces and two Achro- 

 matic objectives, giving a range of power from about 25 to 200 diameters, 

 Condenser on a separate stand, Stage-forceps, and Live-box, packed in a 

 mahogany case ; and the maker, Mr. R. Field, of Birmingham, is bound 

 by his agreement with the Society of Arts to keep it always in stock, so 

 as to supply any purchaser at once. — The Author learned with great 

 satisfaction, that no fewer than 1800 of these Microscopes had been sold 

 up to the end of the year 1861. 



