THE MICROSCOPE. 



15 



injections exhibit under the ordinary Microscope a 

 mass of interlacing vessels, whose relation, being 

 all on the same plane, it is not easy to make out 

 with any degree of satisfaction. But placed under 

 the Binocular they at once assume their relative 

 position. Instead of a flat band of vessels, we now 

 see layer above layer of tissue ; deeper vessels an- 

 astomosing with those more superficial ; the larger 

 vessels sending branches, some forward and some 

 backward, and the whole injection assumes its 

 natural appearance, instead of being only like a 

 picture" 



Fortunately for the possessors of the ordinary 

 Microscope, the Bin- 

 ocular arrangement 

 can be readily adapted 

 to this instrument at 

 a cost of a few 

 pounds. The addi- 

 tional tube and prism 

 does not interfere 

 with the use of the 

 instrument as a mon- 

 ocular, the withdrawal 

 of the prism instantly 

 converts it into that 

 form of instrument : 

 this is necessary when 

 high powers are 

 used. 



The accompanying 

 diagram (fig. 6) a 

 section of the Bin- 

 ocular ^ will give 



the reader a correct Fig, 6. Section of 

 notion of the mecha- Binocular Microscope 



