Short articles describing a model of protein synthesis, a simple constant temperature incubator, techniques for determining the age structure of populations from qualitative characters, an experimental demonstration of proteolytic enzyme action, and apparatus for demonstrating hydrotrophic response of roots and for measuring photosynthetic rate of…

Short articles describe preparation of clean iron sheet for corrosion experiments, models of crystalline structures using glass marbles, photographic production of diffraction grids for producing analogies of X-ray diffraction patterns, and a simple method of determining a reactivity series for the common metals. (AL)

Short articles describing the construction of a self-testing device for learning ionic formulae, problems with standard'' experiments in crystallizing sulfur, preparative details for a cold-setting adhesive and vermillion dye, and providing data related to the industrial manufacture of sulphuric acid. (AL)

Short articles describe a method of introducing the study of simple harmonic motion, and suggest models that are analogues for impedence matching, electrical transformers, and birefringent crystals. (AL)

Short articles describe techniques useful for junior high school science classes, including a method of filling barometer tubes, a method of tracing magnetic fields without loss of iron filings, and a technique for efficient storage and retrieval of overhead projector transparencies. (AL)

Describes the use of laboratory equipment to demonstrate (1) the interference of light coming from an air wedge, (2) the generation of gas-filled soap bubbles, and (3) the generation of beats with a ripple tank. (LC)

Describes the equipment and procedures used to demonstrate (1) light interference with teacher-made photographic film gratings, (2) the minimum angle of deviation for the various lines of a spectrum, and (3) electrostatic phenomena. Written for the high school physics teacher. (LC)