The purpose of this instructional unit is to convey an understanding of the part played by effective problem definition and hypothesis statement in the solution of scientific problems. The major concepts of the unit are process rather than content oriented. Problems, hypotheses, variables, constants and controls represent the principal concepts…

This is the first special issue in the 12-year history of "National Wildlife," and is devoted entirely to endangered species of animals and plants in the United States. An overview of the problem stresses the impact of man's haphazard development, suburban sprawl, and urban pollution upon a fragile environment, resulting in dozens of…

Presents guidelines for the construction and maintenance of a life science culture center with mobile and stationary units. (CP)

Describes activity relating to the study of trees. (SL)

Discusses the use of native Australian plants in 8th and 9th grade Biology classes. (SL)

Describes activities for secondary earth science and biology classes in collecting, preparing, mounting, and manipulating microfossils. (SL)

Describes a number of activities relating to the observation and study of trees. (SL)

Presents the results of a survey to identify and categorize the major difficulties perceived by teachers in their teaching of ecology. Difficulties included teacher training, syllabus difficulties, and teacher approach. Suggests how these difficulties might be overcome. (CW)

Described is a method of rearing common house flies in a biology laboratory. Included are 16 suggested biological investigations utilizing the house-fly. (SL)

Described are activities that can be performed in the classroom by observing living hermit crabs. Tips for the care, feeding, and keeping of crabs in the classroom are also included. (SL)

Described are various activities for studying the behavior of pill bugs (isopods) in the classroom. Details for constructing an observation box are also included. (SL)

Described are techniques for studying spiders in the field. Included is a description of the spider's web building techniques with diagrams, and methods of photographing spider webs. (SL)

Regulations require hazardous gases in school science classrooms to be controlled, i.e., their levels in the air kept below the exposure limits, with fume cupboards being the most usual method. This document reviews the requirements for fume cupboards used in schools and colleges for teaching the sciences, mainly chemistry and biology, up to…

Provides laboratory design and materials needed to have students prepare cell cultures. Necessary techniques are explained along with an outline of some basic and advanced exercises. (DS)