Discusses the nature of man and considers various definitions of the meaning of human being. Concludes that to preserve the uniqueness of man we need to preserve his diversity. (BR)

A discussion of criteria for selection of science books by teachers and librarians, given the limitations of space, funds, and time. (LS)

Some science books are also good literature when judged by literary criteria. A few examples are cited and a selective bibliography is included. (LS)

Summarizes current work on the study of plant hormones, with specific emphasis on the auxin indolylacetic acid and on gibberellic acid. (PEB)

A hypothesis is presented for the regulation of elemental losses from terrestrial ecosystems. Losses of elements are controlled by the net increment of biomass growth and the elemental composition of this net increment. According to this hypothesis, loss rates are highest in early succession and in steady state ecosystems. (Author/EB)

Reports on experiments conducted on two biological clocks, in organisms in the plant and animal kingdoms, which indicate that biological oscillation can be arrested by a single stimulus of a definite strength delivered at the proper time. (GS)

This section presents new ideas with regard to apparatus for teaching physics. The following four ideas are presented: (1) measuring speed of light (2) a poor man's barometer, (3) center of mass of a rotating object, and (4) minimizing glass breakage. (HM)

Describes the use of electrophoresis in the high school utilizing two new gels that are easy to pour, do not require degassing, can be used on a horizontal gel electrophoresis, and are not neurotoxic or carcinogenic health hazards. Large diagrams and written instructions are used to present the protocol of setting up the electrophoresis. (PR)