Describes a laboratory practical on animal behavior suitable for senior secondary school or university biology classes. Several separate exercises relating to the house building behavior of caddis fly larvae are detailed, together with the time required for preparation. (JR)

Describes a demonstration experiment designed to estimate the equilibrium constant by comparing the conductivities of acetic and hydrochloric acids. (CC)

Usually the textbook descriptions of analytical methods fall short of making comparisons among several methods employed for analysis. Emphasis should be placed on making decisions about using a particular method on the basis of its merits. Listed are experiments that could be used for instruction. (PS)

Describes a model that illustrates the operation of principles of adaptive radiation. The model used is constructed of materials that can be easily obtained. Suggestions for use are provided. (PS)

Describes a course based on laboratory use of three skills as a way of teaching a general method of problem solving. (DF)