100 TEACHING SCIENCE IN SECONDARY SCHOOLS


 A Microscope
 Soon the laboratory will need a compound microscope-just
one at first-for demonstration purposes. It is best to buy a good
microscope, fully equipped; but if this is not possible, buy a
good one partially equipped and plan to complete the equip-
ment later. Where funds are low, they may be obtained at a
substantial reduction, modified as described below:
 Compound microscope with the following: With swing sub-
stage, but without Abbe condenser, with iris diaphragm; with
triple nose-piece, but without 1.8 mm. oil-immersion objectives;
with lOx ocular, but without other ocular. Later the missing
parts may be added easily without sending the microscope to the
factory.
 The microscope will require for use:
 V2 oz. cover slips, 3/4 in., round or square, Number 2.
 2z gross microscopic slides.
 These will cost about $3.00. As the laboratory grows, pre-
pared microscopic slides, a projection lantern, lantern slides,
pictures, stereoscopic views, charts, and models will be needed;
but suggestions for a sequence of selection cannot be given here.

 STARTING THE SMALL PHYSICS LABORATORY
 For the material included in this section, the committee
wishes to acknowledge its appreciation to Dr. Hanor A. Webb
of George Peabody College for Teachers.
 First Things First
 What is needed for the laboratory? It will be well to equip
it from three principal sources:
 First, you and the students will make out of simple materials
most of the things you must have.
 Second, you will beg or borrow many things from homes
and stores of your community.
 Third, as you prosper, you will buy.
 Most important are simple things for the pupils to work with.
Next in urgency are simple things for the teacher to demonstrate
with. Then come those standard manufactured articles, which