Describes a simple method for extracting bacterial DNA for use in laboratory investigations to study genetic transformation in bacteria. (BR)

Discusses medical practices and treatments such as blood-letting, purging, leeching and cupping, animal magnetism, homeopathy as well as the quackery problem existing in the present. (BR)

Describes laboratory exercises with chickens selecting their food from dyed and natural corn kernels as a method of demonstrating natural selection. The procedure is based on the fact that organisms that blend into their surroundings escape predation. (BR)

Describes a science activity, using a bacterium and a fungus, to illustrate the effects of competition and barriers on geographical distribution. (Author/PEB)

The first of a three-part article in which the author discusses some past events which provide insight into why the theory of evolution gradually displaced the doctrine of special creation. (PEB)

Describes an experimental "accident" that resulted in much student learning, seeks help in the identification of nematodes, and suggests biology teachers introduce similar accidents into their teaching to stimulate student interest. (PEB)

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

Describes activities that can be done to study insect ecology by use of the galls of goldenrod plants. (RH)

Describes information learned about Mars from past Mariner probes. Discusses future space probes that are expected. (RH)

A possible solution for classroom plant growth where space and time are minimal. Care and plant propagation are discussed. Several experiments in which bryophyllum can be successfully used are described. (EB)