176 THE MICHOSCOPE. Bee. 



a boy or girl of ten or twelve summers may soon learn 

 to find much enjoyment with it. 



This instrument consists of a small wooden case the 

 exact size of that shown in the engraving. To one end 

 of the lid of this box is attached one of the ends of the 

 box and when the lid is reversed and turned upside 

 down it may be slid into the groove of the case and then 

 it forms a stand for the lenses, F, and glass stage, Gr, as 

 shown in the large figure. The lenses and stage are sup- 

 ported by the steel rod D, the lower end of which is 

 hinged to the lid, so that it may be turned down into the 

 groove provided for it. The glass stage Gr, which is fit- 

 ted to a frame of hard rubber, slides easily on the rod D 

 so as to be readily adjustable for focus and can be fas- 

 tened at any desired height by means of a set screw. 

 This glass stage is set in such a manner that when re- 

 versed it forms a cell for holding liquids. In this cell 

 aquatic animals may be examined at leisure. The frame 

 that holds the lenses fits to the top of the stem. A mir- 

 ror, H, is fitted to the box and is easily adjustable, by 

 means of the button shown on the outside, so that the 

 light may be reflected up through the stage when a trans- 

 parent object is to be viewed. When it is desired to use 

 reflected light a dark ground of hard rubber is provided 

 which is carried by the stem D. The lenses are well 

 made by one of our best optical firms, are three in num- 

 ber and so arranged that they can be used singly or to- 

 gether, their magnifying power varying from five to 

 thirty diameters. They are provided with a proper di- 

 aphragm which secures distinctness of vision. If very 

 carefully adjusted the corpuscles may be distinguished 

 in the blood of a frog. 



This instrument sells for the very low price of $2.75, 

 but in order that many young people may become in- 

 terested in microscopy we will for $2.75 send them The 

 Microscope for 1895 and one of these instruments, which 



