OBJECTS FOR THE MICROSCOPE. 





ON THE USE OF THE MICROSCOPE. 



ALTHOUGH a minute description of the construction of the 

 microscope would be out of place in this small work, and 

 involve more of the science of optics than could be under- 

 stood without diagrams and much knowledge of the laws 

 of light, yet it will be useful to give a few hints on the 

 practical management of a newly-purchased instrument. 



Assuming the student to be desirous of obtaining an 

 efficient instrument at a mode- 

 rate cost, he cannot do better 

 than procure what is ordinarily 

 termed a student's microscope, 

 which may be obtained from 

 3 3s. to 5 5s. 



It had long been a desiderata 

 with microscopists to obtain the 

 advantage of binocular vision 

 with stereoscopic effect. Mr. F. 

 H. Wenham was the successful 

 adapter of the stereoscopic prin- 

 ciple to the microscope, which 

 the following extract from ' Re- 

 creative Science/ will clearly 

 explain : 



The result is obtained by the 

 introduction of a small, but very 

 accurately formed, double reflect- 

 ing prism, immediately above the 

 object glass, so as to intercept 

 half the rays of light which pass 

 through it. Fig. 1 will explain 

 the principle : A is the body of 

 an ordinary microscope ; at B a FIG. 1. 



