Describes the determination of vanillin and of other aromatic aldehydes by amperometric titration with 2, 4-dinitrophenylhydrazine. (MLH)

Describes a method in which metals can be identified by the direction of the e.m.f. generated when the junctions in a circuit containing two dissimiliar metals are at different temperatures. (MLH)

Describes the chemistry of dyeing, including acid, basic, vat, and disperse dyes. Includes laboratory experiments. (MLH)

Discusses a laboratory experiment in which uranium is isolated by the reduction of uranyl acetate. (MLH)

Describes the synthesis of a sweetening compound that requires seven laboratory periods of three-hours duration. (MLH)

Describes an entry into the synthesis of the cyclopropenone series that is designed for the undergraduate organic chemistry laboratory. (MLH)

Presented is a practical scheme to enable introductory biology students to investigate the mechanism by which urea is synthesized in the liver. The tissue-slice technique is discussed, and methods for the quantitative analysis of metabolites are presented. (Author/SL)

Described is an undergraduate laboratory experiment involving synthesis of chelidonic acid and its identification in plants. The experiment is offered as an ancillary topic for biology or chemistry classes. (SL)

Discussed is drag experiment for an intermediate level college mechanical physics course. Drag forces exerted on a falling object are examined. (Author/SL)

Describes and evaluates a line of modular electronic instruments that are designed for use in physics instruction, including a power supply, function generator, and counter/timer. (MLH)

Describes two experimental apparatus which may be used to demonstrate the skin effect phenomenon. One apparatus shows the decrease of a magnetic field as it penetrates a thickness of metal; the other demonstrates the decrease with depth of current in a wire. (Author/MLH)

Describes a set of student projects, each involving about 240 hours of laboratory time, covering the following topics: wind power monitoring, wind generator design, solar power, and the heat pump. (MLH)

The equipment and use of language laboratories are described, and their advantages and disadvantages are discussed. Comparisons are made between the use of a language laboratory and the use of tape recorders. (RM)

A study conducted with secondary level students in a Swiss school shows that the future of the language laboratory cannot be disassociated from other aspects of second language teaching. (Text is in French.) (CDSH/CLK)

Suggests using slides with the language laboratory program "English for Today" (Dortmund/Hannover: Lensing Schroedel). The teacher may assemble his own slides. As an example for introducing slides, "the Sights of London" (Chapter III of "English for Today") is suggested. (Text is in German.) (IFS/WGA)