Discusses methods for determining the population size of pond phytoplankton, including water sampling techniques, laboratory analysis of samples, and additional studies worthy of investigation in class or as individual projects. (CS)

Describes methods for building a terraquarium that demonstrates the shore habitat. Includes photographs and a list of materials. (CS)

The learning laboratory of the Training School for Boys, a New Jersey correctional school for eight- to fourteen-year-olds, provides remedial reading instruction through a diagnostic-prescriptive model with the assistance of trained volunteers and interns. (SK)

Describes problems using the Jenkins and White approach and standard diffraction theory when dealing with the topic of finite conjugate, point-source resolution and how they may be resolved using the relatively obscure Abbe's sine theorem. (JN)

Describes methods for studying heart primordia of the chick embryo, using the organ culture method. (CS)

Reviews several specific ways in which office practice simulations can be measured and evaluated, including the salary theory; evaluation of ability to establish priorities and make decisions; evaluation of work produced; and publisher evaluations. (LRA)

Describes the use of undergraduate teaching assistants in electronic circuits and engineering management courses. Teaching assistants guide discussions and assist in laboratory exercises. Requirements for using teaching assistants effectively, benefits to teaching assistants, and possible problems are also discussed. (DS)

Described is a school project to investigate aggregations in flatworms which may be influenced by light intensity, temperature, and some form of chemical stimulus released by already aggregating flatworms. Such investigations could be adopted to suit many educational levels of science laboratory activities. (DS)

Two implanted slide techniques are described by which activity of proteolylic bacteria and the growth of algae in the soil can be readily studied by school students using simple apparatus and methods. Variations are suggested for studying the effects of agricultural practices and environmental conditions on the soil bacteria and algae. (Author/DS)

Presents recommendations sent to schools by the Laboratory Safeguards Sub-Committee in the United Kingdom to prevent hazards of a number of chemicals. How to avoid phosphorous fires and accidents from doing dangerous experiments in chemistry are also included. (HM)

Discusses concept of covalent bonding as related to homonuclear diatomic molecules. Article draws attention to the existence of bound rare gas and alkaline earth diatomic molecules. Summarizes their molecular parameters and offers spectroscopic data. Strength and variation with distance of interatomic attractive forces is given. (Author/SA)

A series of laboratory classes in the Department of Physiology and Pharmacology at Nottingham University are examined including the place of the laboratories within the medical school, the influences promoting changes during the eight years since their inception, and the effects of assessment. Possible criteria for evaluation are described. (JMF)

Describes a method to determine the thermal diffusivity of a polymer, which is suitable for the undergraduate laboratory. It serves as a practical demonstration of classical Fourier theory. (Author/HM)

Describes an undergraduate organic chemistry course at Colorado State University that employs student-designed laboratory procedures in the laboratory. An outline illustrating the use of this approach is included. Advantages over the traditional approach are detailed. (BT)

Describes the latest stage in the design of an economical dielectric constant cell, tested in both instructional and research applications, that is suitable for student laboratories and for precision research measurements. (BT)