94 



CONSTRUCTION OP THE MICROSCOPE. 



Fig. 16. 



from about five to forty diameters, is obtained. The stage is 

 perforated with a hole at each comer; into any one of which may 



be fitted a condensing 

 lens for opaque objects 

 (§ 64), or a pair of 

 stage-forceps (§ 66). An 

 aquatic-liox for the ex- 

 amination of objects in 

 water (§ 68) is also sup- 

 plied.' This instrument 

 is peculiarly adapted for 

 educational purposes f 

 being fitted in every 

 particular for the ex- 

 amination of botanical 

 specimens, small insects 

 or parts of insects, water 

 flies, the larger animal- 

 cules, and other such 

 objects as young people 

 may readily collect and 

 prepare for themselves ; 



and such as have 



trained themselves in 



Field's Simple Microscope. j-]^g application of it 



to the study of ISTature, are well }irepared for the advantageous 

 use of the Compound Microscope. But it also afibrds to the 

 scientific inquirer all that is . essential to the pursuit of such 

 investigations, as are best followed out by the concurrent em- 

 ployment of a Simple and a Compound Microscope, the former 

 being most fitted for the preparation, and the latter for the 

 examination, of many kinds of objects;' — and it maybe easily 

 adapted to the purposes of dissection, by placing it between arm- 

 rests (§ 104), or blocks of wood, or books piled one on another, so 

 as to give a support for the hand on either side, at or near the 

 level of the stage. 



30. Qiu'kett'ti Dissecting Microscope. — To the scientific investi- 

 gator, however, it is generally more convenient to have a larger 

 stage than the preceding instrument afibrds ; and in this respect 

 an arrangement devised by Mr. Quekett (Fig. 17) will be found 

 extremely convenient. The stage, which constitutes the princi- 

 pal part of tlie apparatus, is a plate of lirass (l»ronzed) nearly six 

 inches square, screwed to a piece of mahogany of the same size 

 and about |ths of an inch thick ; underneath this a folding flap 



' Tlio price of tlie in.^trumcnt, with ;ill these appurtenances, packet! in a neat ma- 

 hogany box, is or)]y half a guivea : and the maker, Mr. G. Fiel(t, of Birmingham, is 

 bound by his agreement with the Society of Arts to keep it always in stock. See also 

 §:!l.^ 



^ Sue Introduction, pp. GO, 01. ^ Sou IntroiUiction, p. 63. 



