ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 



113 



As the Microscope has only one objective, and one eye-piece, 

 and therefore only admits of a fixed magnifying power, a special 

 focusing arrangement is not necessary. The tube of the Microscope 

 is so fixed, that the image of the preparation is always in the field of 

 view of the eye-piece, and only in the case of differences in the eyes 

 of observers is a small shifting of the tube, amounting to a few 

 millimetres, requisite. For this purpose the body-tube is easily 

 pushed with the hand up or down, guided by a pin working in the 



Fig. 10 A. 



Fig. 10 B. 



small slit in its sheath, without ever thereby losing sight of the 

 image of the preparation, as happens with other Microscopes. 



The magnifying power is such that most popular objects can be 

 seen distinctly and perfectly. The images are of unsurpassed sharp- 

 ness and clearness. 



The field of view is very large, and all preparations which are 

 not more than 4 mm. m diameter can be seen entire at one view. 



An entirely special advantage of this new Microscope is the 

 uncommonly simple manner in which the teacher or student is enabled 



Ser. 2.— Vol. IV. j 



