Experimental procedures and typical student data/results are provided for an experiment determining the sodium (parts per million) in salt substitute with an error of a few percent. Problems encountered with the technique are addressed. (Author/JN)

Various chromatographic techniques are reviewed, including, among others, elution, liquid-liquid, column-partition, qualitative and quantitative, and plan partition chromatography. (SK)

Described is a conductiometric method for following the course of diffusion of aquated ions through a cellulose membrane. Several experiments using the method are described. (Author/SA)

Discusses forensic science in general and forensic chemistry in particular, including laboratory techniques used by forensic chemists and toxicologists. (SK)

Traces the history and development of the Deep Sea Drilling Project, focusing on the Glomar Challenger, drilling improvements, and international significance. Includes photographs, illustrations, and tables. (DC)

Laboratory procedures, calculations, and sample results are described for a freshman chemistry experiment in which the Clausius-Clapeyron equation is introduced as a means of describing the variation of vapor pressure with temperature and for determining enthalpy of vaporization. (Author/SK)

The status of current techniques and methods of atomic absorption (AA) spectroscopy (flame, hybrid, and furnace AA) is discussed, including limitations. Technological opportunities and how they may be used in AA are also discussed, focusing on automation, microprocessors, continuum AA, hybrid analyses, and others. (Author/JN)

Selected high-sensitivity spectrophotometric methods are examined, and comparisons are made of their relative strengths and weaknesses and the circumstances for which each can best be applied. Methods include long path cells, noise reduction, laser intracavity absorption, thermocouple calorimetry, photoacoustic methods, and thermo-optical methods.…

Studied increased self-reported daydreaming as measured by the daydreaming frequency scale of the Imaginal Processes Inventory, after treatments of being presented with either a positive or neutral talk about the value of daydreaming and training v no training in the use of imagery. (Author)

Describes a milk bubble machine to be used to demonstrate the acceleration of gravity in the classroom. Instructions are given for the construction of the milk-bubble-acceleration-of-gravity machine. (Author/DS)

The author proposes a design for science instruction in the middle school years, ages 9-13. (SJL)

Analyzes the literature concerning learning centers. Concludes that there are two definitions of the term, one meaning the improvement of a student's ability to learn independently, primarily through learning skills instruction and counseling, and the other meaning the individualizing of instruction and learning activities through the use of…

Laboratory practice requires preparation in class and adequate follow-up. Like the library, it does not replace the teacher but is an auxiliary to teaching. The laboratory is not a panacea, but a place for continued experimentation and innovation in teaching methods. Variety in instruction is required. (PJM)

The article reviews elements of the learning-station-process approach for gifted students, a method designed to support creative probing. Considered are the following: atmosphere, space, storage areas, supplies and materials, directions, references, organization, time management, record keeping, facilitation, and prescriptive activities. (SBH)

A two-credit course for students who wish to tutor in a writing lab focuses on helping students objectively evaluate compositions and respond appropriately to them. (DD)