Discusses research strategies employed in studies of the importance of adult social cues in controlling children's behavior, illustrating some of the limitations of sole reliance on laboratory paradigms for achieving an understanding of both the contemporaneous operation and the development of social cue effectiveness. (JH)

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

Describes an experiment that illustrates the following points concerning the experimental determination of trypsin activity: (1) there is a difference in basing enzyme concentration on weight, absorbance, or active sites; and (2) the method of expressing enzyme concentration determines the value of specific, molecular, and catalytic center…

Describes an experiment in which the technique of ph-controlled extractive separation is used to separate a mixture of drugs aspirin (acidic), caffeine (basic), and phenacetin (neutral). (MLH)

Described is a physics experiment which investigates the reactions occurring when a hot dog is fried or broiled. (SL)

Describes three experiments illustrating some technological applications of liquid crystal substances, which are currently used to display numbers and letters by scattering of ambient light. (MLH)

Discusses the planning and organization of an instrumental analysis course for chemistry majors designed to acquaint the students with an appreciation of the variety of ways available for a given analysis. Describes grading procedures and the use of taped lectures. (MLH)

Suggests a study of plant dyes as a way of stimulating student interest and enthusiasm; provides an example of a student report on this subject. (GS)

Results of psychological experiments usinganimals are presented. Use of the animal-human analogy to generalize these findings to humans is discussed. Ethological studies are interpreted in light of the total environment and situation involved. The completeness of the ethological model compared to the animal-experimental model is discussed. (LS)

Ten laboratory exercises on optics are described to clarify concepts involving point objects and converging lenses producing real images. Mathematical treatment is kept to a minimum to stress concepts involved. (PS)

Discusses five experimental methods used by senior high school students to provide an accurate calibration curve of magnet current against the magnetic flux density produced by an electromagnet. Compares the relative merits of the five methods, both as measurements and from an educational viewpoint. (JR)

Briefly outlines the theoretical basis of the phenomenon of photoconductivity and describes a simple experiment which demonstrates the photoconductive properties of cadmium sulfide. (JR)

Based on an unpublished doctoral dissertation, Department of Psychology, University of North Carolina at Chapel Hill, 1969. (RS)