98 TEACHING SCIENCE IN SECONDARY SCHOOLS


aquaria, killing bottles, plant presses, boxes for raising seedlings,
terraria, or cages for land animals.

 Laboratory Supplies That May Be Collected by the Class
 Insects of various kinds, in autumn; cocoons and egg masses, in winter.
 Leaves, twigs, and wood of deciduous and evergreen trees, in autumn
 and winter.
 Algae, mushrooms, molds, sea weed, liverworts, mosses and ferns.
 Wild flowers, in autumn and spring.
 Crayfish, in autumn and spring.
 Hydra in late autumn, winter and early spring, in the South.
 Mollusks and snail eggs.
 Planaria, in the spring.
 Tapeworms and roundworms, at any time, from chicken entrails.
 Earthworms, best in the spring.
 Millipedes and centipedes.
 Fish, during the open season.
 Salamanders, frogs and their eggs, best in the spring.
 Lizards, snakes, and turtles, in autumn and spring.
 Birds-use English sparrows, pigeons, chickens or other birds not pro-
 tected by law.
 Fossils.
 Supplemental Material
 Additional material for making the work more satisfactory
 should be added as soon as possible. Fifty dollars would add the
 following equipment and supplies:
 Equipment
 1 large bell jar, tall, with knob and ground rim
 1 large piece of glass, double thickness; size, 12 in. by 12 in.
 3 iron supports, with three large rings and three clamps.
 4 doz. test tubes (three for each student); size, 4 in. by 53/4 in.
 4 alcohol lamps (substitute four Bunsen burners where gas is avail-
 able).
 1 set of cork borers; sizes, 1 to 3.
 2 dry-cell batteries, with 5 ft. of insulated wire.
 1 triangular file, 6 in.
 4 sq. ft. of iron wire gauze, mesh 6 (cut into squares, 6 in. by 6 in.
 with an old pair of scissors).
 5 ft. of rubber tubing, 3 mm. size.
 1 lb. of glass tubing, soft, 3 mm. size.
 1 gallon of alcohol.
 1 oz. of phosphorus, yellow.
 1 lb. of potassium chlorate.