THE MICROSCOPE. 223 
CORRESPONDENCE AND QUERIES. 
DesPeres, St. Louis Co., Mo., May 29, 1889. 
Epitor Microscope: 
Some time ago a writer declared it impossible to examine un- 
mounted objects in fluid with an inclined microscope. Yet I have 
done this impossible thing for years. I always keep on hand anum- 
ber of rubber cells of all sizes, shapes and depths, cemented to 
glass slips with gold size. In examining an object, I till a cell with 
the resp. fluid, put the object in it, and cover it with thin glass 
overlapping the cell. Superfluous fluid is removed with blotting 
paper, and your object is ready for examination in any position of 
the microscope. Moreover you may keep the object. I kept one 
in glycerin for one year and then mounted it permanently 
in the same fluid. In doing this, I always use a cover of the exact 
size of the outside diameter of the cell, and am never troubled with 
cement running in, or air bubbles. 
For illumination, I use the Acme lamp of Queen & Co., with 
stand and color-correcting glasses. Microscope and lamp are fitted 
to a board so that both may be taken off at once. The lamp may 
be slid on the board in a straight line, and the microscope turned 
concentrically on its base. To exclude the glare of the lamp, I 
fitted pasteboard shades to it. This lamp saves me a condenser or 
stand, and is more conveniently used than the latter. The other 
lamp is a night lamp of the same size as the Acme, and is used to 
allow one to arrange or dissect objects. This lamp is covered with 
a pasteboard tube, when using the microscope, thus doing away 
with all diffused light. 
Microscope and Acme lamp when not in use are covered with 
pasteboard boxes made by myself. They are more convenient than 
glass shades and cost me nothing. 
Yours respectfully, Paut W. Gaver. 
16. Where may the Pinnefore lamp mentioned on page 139 
of THe Microscope be obtained ? VAS Di 
16. (Ans.)—The Pinnefore lamp burner to which I referred on 
page 139 of Tue Microscore for May is for sale at all the leading 
lamp stores. It is used in many of the street cars of this city and 
gives avery bright light. The burner can be supplied with bowl, 
shade, etc., to suit the taste of the purchaser. The outfit I des- 
cribed is for class-room use. Other combinations may be more 
convenient for special use, but I doubt if a more serviceable burner 
than the Pinnefore can be found in the market. 
Sr. Louris, June, 1889. H. M. WHE LpLey. 
