The Microscope. 287 



Clinical Report op Six Months' P^xrEiiiENCE with the Pnkumatic Cabi- 

 net, by C. W. McCaskey, A. M., M. D. Eoprint. 



On the Use op the Microscope in Determining the Sanitary Value of 

 Potable Water, by Geo. W. Rafter. Reprint. 



Pneumatic Dipferenti.vtion and the Pneumatic Dikfekentiat, Process, 

 by Herbert F. Williams, M D. Reprint. 



How TO Study the Biology of a Water Supply, by Geo. W. Rafter, 

 M. Am Soc. C. E. Reprint. 



Eighth Annual Commencement of the Indiana Eclectic Medical 

 College, 18«7-88. 



The Staining of Animal and Vegetable Tissues, by Arthur J. Doherty. 

 Reprint. 



Announcement of P. Blakiston, Son & Co.'s New Series of Manuals. 



Microscopy. Reprints from American Ndturalist, by Dr. C S. Whitman. 



CORRESPONDENCE AND QUERIES. 



Eagle Bridge, N. Y., July 25, 1887. 

 Editors of The Microscope. 



Dear Sirs, — In your last number you say, that all who can 

 afPord it should by all means own a microtome. I have one which 

 anyone can affoi'd, for the microscopist with a little ingenuity, (and 

 all microscopists are supposed to be ingenious), can make one for 

 himself. The materials needed are a block of hard wood 5 x 3f x 2, a 

 fine thumbscrew with a nut on it, a piece of glass tubing and a glass 

 slide cut lengthwise through the middle. Plane the top of the block 

 perfectly true, then bore a hole, the centre of which should be 1|^ 

 inches from the end, which the glass tube will exactly fit. Saw a 

 strip from the bottom of the block and fit the nut in the hole. Cement 

 the glass tube in the hole in the large block with marine glue, allow- 

 ing it to project through nearly the thickness of the glass slide. 

 Cement the g ass slips on the top touching each side of the tube. 

 Fit a block of wood 1^ inches long, with a rivet in the liottom so that 

 the thumb screw will work smoothly on it, to the glass tube. 

 Screw the f inch strip with the notch in it to the block and cut a 

 notch \\ X 2i in the block to fasten it to a table and the microtome 

 is complete. Sections may be cut with a flat or common razor. 



George Gat. 



