Aids for the biology teacher.

The article presents information on various classroom equipments which are helpful for the biology teachers in the United States. According to the author, display boards which are a modification of riker boxes can be made for flat, thin specimens such as leaves and flowers. A heavy thin sheet of cotton batting forms the foundation under the specimens. A durable and cheap substitute for chart cloth is waterproof sign cloth. This material is available at art supply shops. The common art of soap carving has proven a valuable aid to biology teachers in presenting three dimensional conceptions of biological subjects. Melted crayola wax crayons can be used as paints to color the different structures in the classrooms. An unbreakable board can be made by substitution of celluloid sheets for a glass. The glue, which is similar to commercial products called cold or liquid solder, is made by dissolving celluloid in acetone.