The history of the discovery of iodine is retold using brown-colored seaweed found commonly along the ocean shore. The seaweed is ashed at a low temperature and the iodides are extracted into boiling water. The iodides are oxidized in acidic medium. Solvent extraction of iodine by oxidation of iodides as well as simple aqueous extraction of iodide…

Measured magnetic susceptibilities of paramagnetic substances must typically be corrected for their underlying diamagnetism. This correction is often accomplished by using tabulated values for the diamagnetism of atoms, ions, or whole molecules. These tabulated values can be problematic since many sources contain incomplete and conflicting data.…

Tests the hypothesis that the effectiveness of discriminative stimuli as reinforcers is a function of the magnitude of the difference between them. (Author/RK)

Research for this report supported by grants from the National Research Council and the Medical Research Council of Canada. (RS)

Research supported in part by grants from the National Institute of Child Health and Human Development. (RS)

Investigates memory capacity in rats for information about spatial location and provides information about some of the characteristics of the storage process used in this memory. (Author/RK)

Four experiments examined the possibility that the outcome of simultaneous and backward fear conditioning procedures might depend upon the number of conditioned stimulus-unconditioned stimulus pairings. (Editor/RK)

Research supported by a grant from the National Research Council of Canada. (RS)

Research supported by a grant from the National Institute of Mental Health. (RS)

Revised version of a paper presented at the 79th Meeting of the Acoustical Society of America, Atlantic City, N.J., April 21-24, 1970; research supported in part by the Science Research Council (U.K.) and by the National Institutes of Health. (RS)

Discusses the perceived importance of practical components in natural science undergraduate programs in distance and residential universities in the Netherlands. Surveys of faculty responsible for undergraduate practicals rated general and specific learning objectives. (Contains 26 references.) (SLW)

This paper is a discussion of how videocassette tape recording is used and the results of its use, in general chemistry pre-laboratory instruction at the University of Southern Mississippi. (Author)