246 THE MICROSCOPE. 



ingly small pieces, tear them apart with needles, or make 

 very delicate sections with a sharp knife. 



20. Incentives to Study. A complete knowledge of 

 all minute structures is not to be expected at once, for you 

 are here introduced into a new realm of Nature, a world 

 of little things as vast, as wonderful, and as carefully con- 

 structed as the starry firmament, that other realm of 

 grand objects which the astronomer nightly scans with the 

 telescope. It will not appear singular, therefore, if, at first, 

 you feel strange and awkward in this new creation. With a 

 little perseverance, however, and with the attention directed 

 toward simple objects at the outset, it will not be long be- 

 fore an increasing experience will engender confidence. 



21. If to all this there be added an enthusiastic study of 

 the standard authorities on the subject, the rate of progress 

 will be by so much the more rapid. As compared with 

 similar studies, few possess more interest than microscopy, 

 and to the one who pursues it with fondness, it constantly 

 affords sources of pleasure and agreeable surprises ; and in 

 the end, often leads to new and valuable additions to the 

 sum of human knowledge. The depths which the micro- 

 scope is employed to fathom are no more completely known, 

 than are the heights above us explored and comprehended 

 by the astronomer. 



QUESTIONS FOR TOPICAL REVIEW. 

 State what you can on the following subjects: 



\ . Voice and speech 227, 228 ; 8. Necessity of the microscope ... 236 



2. The or<;an of the voice 2-28, 229 ! 9. Convex lenses :>: J >r>, 237 



3. The vocal cords 230. 231 , 10. Kinds of microscope 2:>7. 23S 



4. The production of the voice. 232. 233 ; 11. Choosinsr a microscope 23'.). 242 



5. The varieties of voice 233, 234 \ 12. Preliminary studies 243, 244 



6. Ventriloquism 235 \ 13. The study of hnman tissues 244 



7. The law of the tissues 236 I 14. The study of the inferior animals 215 



