This experiment uses a radioactive technique to determine the relative leaving abilities of chloride and iodide in nucleophilic substitution reactions. (DT)

Two experiments are described which illustrate preparative as well as mechanistic features of the reactions of halogens with alkanes and alkenes. (DT)

By concentrating radioactivity contained on luminous dials, a teacher can make a high reading source for classroom experiments on radiation. The preparation of the source and its uses are described. (DT)

Describes procedures and materials for preparing microscope slides. Comments on selection and proper care of slides are also included. (RH)

Discussed and described are analytical instruments available for chemical analysis in 1940-41. (RH)

This paper describes a computer model that simulates experimental outcome data obtained by the manipulation of 13 independent variables reported in studies investigating the group risky shift. The model is intended as a tool for teaching research methods in an undergraduate course in social psychology. (Author)

A description of a learning center at Kingston College of Further Education. (HB)

Article presents an observation instrument for observing learning center instruction and the results of such observations in an audio-tutorial physics course at Cornell University. (Author)

This set of laboratory exercises in general science is an outgrowth of courses given by the author in methods of teaching secondary school sciences. Many of the exercises have enough material for more than one lesson and should be subdivided to suit teaching conditions. The emphasis placed in these lessons upon the interests of the individual, in…