THE MICROSCOPE AND ITS PARTS. 17 



tive for some time, and his eye lias become educated, he 

 will begin to catch glimpses of minute objects beyond 

 the ability of the low-power glass to properly exhibit. 

 Then he will wish for something more, so that he can 

 look deeper into the little things of nature. What shall 

 it be ? The opticians make ^, T ^, and even -^ inch ob- 

 jectives, which magnify enormously, cost frightfully, 

 and can be successfully used only by accomplished mi- 

 croscopists on large and first-class stands. To the be- 

 ginner, even after considerable experience with the 

 low-power, any objective higher than the or -- will be 

 useless. With these glasses he will be well equipped 

 for quite extensive microscopical study, until he is ready 

 to undertake original work in some unexplored depart- 

 ment of science, or in some partially neglected corner, 

 of which there are many in every scientific field, how- 

 ever well cultivated. Like the one -inch, the % or -J- 

 will always be useful. As the observer's eye becomes 

 better educated, when it learns, as it will, to see minute 

 parts of delicate objects, which at the start were entire- 

 ly, overlooked, the high -power objective will not be 

 thrown aside, the student will not become disgusted 

 with it as lie would with a high-power French triplet, 

 but his quickened sight will again catch glimpses of 

 beauty to be examined, and mystery to be unravelled, 

 which are beyond the power of his best objective, and he 

 will almost unconsciously have advanced another step. 



Personally the writer prefers the ^ inch objective to 

 the ^, and such a glass need not be expensive to be good 



