CHAPTER XVII. 



THE LANTERN MICROSCOPE AND THE OPAQUE. LANTERN. 



|P to a recent date the so-called lantern micro 

 scope supplied by various dealers was but a toy, 

 having all the faults which it was possible to 

 imagine in an optical instrument. Moreover, it neces- 

 sitated the use of specially prepared objects of large size, 

 the wings of insects and the like. But latterly a good deal 

 of ingenuity has been expended on the instrument, and it 

 has been brought to great perfection. Objects as prepared 

 for the ordinary microscope can now be used for projection 

 in the lantern microscope, and this one change of the 

 conditions under which the instrument can be used points 

 to an improvement of no mean kind. 



There are certain requirements to be looked for in a 

 really serviceable lantern microscope. The first of them is 

 good illumination. The most perfect form of limelight jet 

 must therefore be used, and even this, when the higher 



