This article tells how to prepare and use frog leg bones in the classroom. (BB)

Ideas are presented for demonstrating the kilometer to school children. (BB)

Two learning activities are presented to develop observation and classification skills at the elementary level. The first is an electric box that associates tree names with leaf and bark specimens, and the second is a pond water observation and slide preparation activity. (BB)

Special education teachers were introduced to Elementary Science Study (ESS) units and used these materials in their classes. (BB)

Learning of the concept of horizontality by fourth graders was investigated. Comparisons by age and sex were made. (BB)

Elodea is an attractive plant, well suited for classroom aquaria. This article describes the collection, care, and maintenance of this plant. (BB)

Rain observation activities are described for preschool and lower-elementary children. (BB)

Two elementary school metric measurement units are reviewed. (BB)

Discusses some of the prevalent educational attitudes and philosophies from colonial times to the present. (MLH)

Discusses references from the McGuffey Readers pertaining to the sun, the predator-prey relationship, the habits and characteristics of birds and animals, and the composition of the earth. (MLH)

Presents classroom activities for teaching microbiology at the elementary and secondary levels. Activities demonstrate the existence of the microbial world, types of microbes, and their growth needs and effects in nature. (MLH)

Presents an elementary science evaluation scheme as an alternative to letter grades. Provides criteria for four main areas of evaluation: tests, experiments, projects, and scientific interest of the child. (MLH)

Suggests that the effectiveness of non-directive, activity-centered teaching methods can be enhanced when the teacher spends less time interacting with students and more time observing them. (MLH)

Describes a classroom game demonstrating the effect people have upon their environmental system. Presents the rules and examples of playing cards that can be cut out, copied, or pasted on filecards. (MLH)

Describes a program for purchasing materials in which local merchants and schools cooperate for the convenience of the teachers who must stock science supplies. (MLH)