Describes two simple, economic timers suitable for measuring time intervals with fractional millisecond resolution in physics experiments. (MLH)

Describes a technique for preparing and conducting biology laboratory examinations with 35-mm slides in lieu of actual laboratory equipment and materials. Major benefits stressed are the saving of time and preparation when utilized with individualized learning programs and make-up examinations. (SL)

Reports the presence and use of known carcinogens in Kentucky colleges, junior colleges, and high schools. Includes a listing of known carcinogens and the synonym names under which each may be labeled. (SL)

Presents an experiment involving the identification of FD&C dyes by visible spectroscopy. (SL)

Describes a recording gas microvolumeter constructed to carry out sensitive studies of the kinetics of photodecomposition of water. (SL)

Describes an experiment which allows students to observe the four oxidation states of vanadium obtained in aqueous solution. (SL)

Describes basic laboratory procedures in a secondary level experiment designed to relate ionic and descriptive chemistry. (SL)

Describes an undergraduate physical chemistry experiment in isotope separation which utilizes a carbon dioxide laser. (SL)

Describes multifunctional instruments which combine the functions of power supplies, amplifiers, oscillators, and various switching circuits. (SL)

Describes d.c. amplifiers available through English manufacturers and laboratory experiments which can be performed with them. (SL)

Describes ways to help students improve their spelling ability. (MKM)

Describes an experimental arrangement which provides a simple introduction to holographic interferometry. (SL)

Describes a method for testing the chlorine content of water. (SL)

Describes experiments used to illustrate the kinetics of reversible chemical reaction. (SL)