100 PRACTICAL TREATISE ON THE MICROSCOPE. 



justment ; the stage consists of the usual sliding-plate, which 

 may be moved up and down by the fingers, or by a lever, 

 after the author's plan; the under surface of the stage is 

 suppHed with a diaphragm. 



Another microscope, made by Mr. Pillischer, is contained 

 in a box seven inches long, by four inches broad, and two-and- 

 a-half inches deep ; this box forms the foot, and into the cover 

 screws a tube, three quarters of an inch in diameter and six 

 inches in length, having another tube sliding within it capable 

 of being moved up and down slowly by means of a fine screw ; 

 to this tube is attached a strong arm, to which the compound 

 body, six inches in length, is screwed ; the compound body is 

 also composed of two tubes, and before being used, the inner 

 one is drawn out two inches, to make it the usual length. 

 The stage is of an oblong square figure, and one of its edges 

 is furnished with a tongue-piece to slip into a slot attached to 

 a short piece of tube which slides up and down the main 

 stem, and so forms the coarse adjustment. The mirror is 

 situated at the bottom of the stem, and is mounted in the 

 usual manner. This instrument will answer for all the pur- 

 poses for which an ordinary microscope can be used, either in 

 the inclined or vertical position, the inclination being given 

 by opening the cover and keeping it in one place, by means 

 of two long hooks. The low price and portability of this 

 instrument are its principal recommendations. 



Although the microscope stands of Mr. Pillischer do not 

 differ very materially in external form from 1':ose previously 

 described, yet, from being very simple in their construction, 

 he is enabled to furnish them at a rather cheaper rate than 

 those manufactured by the more celebrated opticians. The 

 author, however, from what he has seen, can speak well of the 

 manner in which the work is executed, and thinks that of 

 the microscopes manufactured in this metropolis, the stands of 

 Mr. Pillischer are next in point of merit to those of Messrs. 

 Powell, Ross, and Smith. 



Mr. King, of Bristol, has been for some years a maker of 

 the stands of achromatic microscopes ; he usually supplies two 

 kinds, one very similar to that of Messrs. Powell and Lea- 



