THE MICROSCOPE. 



make a few remarks on the "mounting" of micro- 

 scopic objects in another chapter. 



The microscope depicted in the adjoining woodcut 

 represents one of Nachet's stereoscopic binoculars. 



The stereoscopic 

 effect is produced by 

 a peculiar Arrange- 

 ment of prisms. The 

 binocular microscope, 

 though it can hardly 

 be regarded as ne- 

 cessary for the stu- 

 dent, is veiy useful 

 in the examination 

 of opaque objects of 

 solid form, and also 

 of transparent ob- 

 jects, when we wish 

 to ascertain the dis- 

 tinction between 

 their nearer and more 

 distant surfaces. The 

 prolonged use of a 

 binocular is attended 

 with less fatigue than 

 that of the monocular, 

 and should you de- 

 sire to procure one, 

 Messrs. Beck and 

 Beck, or Mr. Crouch, or Mr. Collins, or any other 

 well-known maker, will supply you with an excellent 

 one at the cost of about ten or twelve pounds. An 

 ordinary monocular microscope can be converted into 

 a stereoscopic binocular, should you desire it. The 

 woodcut in page 15 represents three observers using 

 one of the triple- bodied microscopes of M. Nachet. 



A Binocular Microscope. 



