THE AMERICAN 



MONTHLY 



MICROSCOPICAL JOURNAL. 



VOL. XIX. MARCH, 1898. NO. 3. 



Contents. 



Glass Stage Plate with Rectangular Movements _ 33 



On Double Color Illumination 37 



Recent Diatom Discoveries 38 



Practical Suggestions, — Mounting Uncinulas, Exhibits, 



Sclerogen 39 



EdiToriai,. — Image of an Image, Fish Commission, Testing Tu- 

 berculous Milk, Fine Meshes, Societies, Subscribers, Flour, Dia- 

 toms, Government Position, Observer, The Tariff 41 



Science Gossip. — Amplifier, Epithelioma, Gastric Ulcers 45 



Recent PubIvICATions. — Histology, Tariff, Whist, Ephemeris, 



Photomicrography „ 46 



MiscElIvAneous. — For Sale, Exchange, etc 47 



A Glass Stage Plate with Rectangular Movements. 



By K. N. Cunningham. 

 The need of rectilinear motions in transverse directions, 

 gave rise long ago to the mechanical stage ; how to make 

 a substitute may not be inopportune. Procure a smooth, 

 even-surfaced strip of good quality, window-glass, 8 

 inches long, 3f inches wide, and ^ inch thick. Cut it 

 neatly into two pieces of equal size (4 x 3f inches). Use 

 one as the base plate, the other to cut into three pieces, 

 but one a narrow strip of 1 inch in width, leaving the two 

 other pieces of equal size, say 3| x 1|. The 1 inch strip, 

 must be shortened to 2J inches in length, this piece to be 

 known as the slide carrier. After the four separate parts 

 are prepared, their edges should be evenly ground with 

 wet sand on a flat piece of sandstone. This gives the 



