Describes an apparatus designed to investigate molecular motion by means of light scattering. Light from a He-Ne laser is focused into a cell containing a suspension of polystyrene spheres. The scattered light, collected on the photosurface of a photomultiplier tube, is analyzed. The apparatus won first prize in Demonstration Lecture Apparatus in…

Reviews Hanson's findings that laboratory research tends to demonstrate a positive correlation between attitudes and behavior while field research does not. This article, by adding date of publication, shows that the trend over time, presumably because of improved methodology, is toward more positive correlations in both settings. (Author/JAC)

Presents experiments to introduce students to the phenomenon of biological rhythmicity and to reinforce the fact that there are differences in the physiology of human beings. (Author/MA)

Examines the pitfalls of understanding and interpreting venous physiology. Includes techniques to measure reflex changes in capacity vessel pressure--volume characteristics. (MA)

A test is described in which three psychotropic drugs were evaluated for their effects on pregnant rats. Behavioral changes are given. (SA)

A laboratory exercise for dental students is presented using a toxic dose of lidocaine in place of an anesthetic dose of pentobarbital. The use of lidocaine demonstrates its toxic and lethal actions and increases the relevance of the experience for dental students. (Author/MLW)

Discusses the existence of spirals in nature in general, supplying many examples, and explains how a particular organism, Phycomyces, accomplishes this feat. (GA)

Describes process-based practical work used in Scottish high school examinations and evaluates this work against a standard of course objectives for practical work in general. (MLH)

Discusses how students can investigate the relationship between the current and the voltage across a field coil by using a current that has a triangular waveform. (MLH)