This full-size poster profiles 11 wildlife species that are endangered. Color illustrations of animals and plants are accompanied by narrative describing their habitats and reasons for endangerment. The reverse side of the poster contains information on the Endangered Species Act, why protecting endangered and threatened species is important, how…

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)

Children are busy observers of natural objects, and have many questions to ask about them. But their inquisitive observation is commonly repressed, instead of being encouraged and guided. In this book the object of the author is to supply the mother and the teacher with the means of introducing the child into one department of natural…

The bibliographies in this series constitute a preliminary guide to the circulating and reference Alaskana collection of the Elmer E. Rasmuson library at the University of Alaska, Fairbanks. The material was selected using the triple criteria of information value, availability, and suitability for a small general interest collection. No childrens'…

This is the third in a series of guides to the field identification of North American marsh and water plants. Described are plants which have foliage habitually under water or floating, or which have underwater or floating forms, and which have characteristics by which they can be distinguished with the naked eye. Where genera or species cannot be…

Examines proposals for energy production from organic substances such as wastes, trees, and grain and foilage crops. Describes techniques of energy extraction from these substances. (CP)

Conventional sellotape techniques for fungal mounting produce interference patterns when using Normarsky microscopy. A technique is described which overcomes this problem and produces a permanent mount with a completely clear background. (Author/JN)

Two lakes were investigated, and students learned skills necessary for winter survival. (FF)

Author has found that zeroing in on a particular tree can lead to expanding a child's interest concerning trees everywhere. (RB)

Suggests suitable species of microscopic green algae for demonstrating diversity of form, increasing complexity in related species, the animal" and plant" characteristics of protists, and protist behavior. (AL)

Describes Boerhaave's contributions to botany, physiology, medical education, and chemistry from the late 17th to the early 18th centuries; his influence on other academics in Europe and North America is also discussed. (AL)