‘APPENDIX A. 
- THE USE OF THE COMPOUND MICROSCOPE. 
The Instrument. — For elementary class work, a low-priced but | 
strong and well-made instrument is needed. Several of the German 
makers furnish excellent instruments for use in such a course as that 
-here outlined. The author is most familiar with the Leitz micro- 
scopes, which are furnished by Wm. Krafft, 411 West 59th St., New 
York City, or by the Franklin Educational Co., 15 and 17 Harcourt 
St., Boston. The Leitz Stand, No. IV, can be furnished duty free 
(for schools only), with objectives 1, 3, and 5, eye-pieces I and III, for 
$24.50. If several instruments are being provided, it would be well 
to have part of them equipped with objectives 3 and 7, and eye-pieces 
Land Ill. The best form of camera lucida for this microscope costs 
(duty free) $7.80. 
- The American manufacturers, Bausch & Lomb Optical Company, 
Rochester, N. Y., and No. 130 Fulton Street, New York City, have 
this year produced a microscope of the Continental type which is 
especially designed to meet the requirements of the secondary schools 
for an instrument with rack and pinion coarse adjustment and 
serviceable fine adjustment, at a low price. They furnish this new 
stand, “ AAB,” to schools and teachers at “duty-free” rates, the prices 
being, for the stand with two eye-pieces (any desired power), 2-inch 
and 4-inch objectives, $25.60, or with 2-inch, 2-inch and 41-inch objec- 
tives, and two eye-pieces, $29.20. 
- Stand « A,” the same stand as the « AAB,” without joint and 
with sliding tube coarse adjustment (as in the Leitz Stand IV), and 
with three eye-pieces and 2-inch and 14-inch objectives, is furnished 
for $20.40. Stand « A,” with two eye-pieces, 2-inch and 21-inch objec- 
tives, $20.40. 
Class Use of the Microscope. —If the class works in a special 
laboratory in small divisions (not more than twelve), the teacher can 
examine the preparation of the object, the focusing of the instrument, 
