771. Mitosis and meiosis (17:01)

Date:
1956
Summary:
Uses stained cells, animation, and time-lapse cinephotomicrography of living cells to compare mitosis and meiosis. Shows onion root tip, whitefish embryo, salamander epidermal, and living Tradescantia staminal hair cells photographed in time-lapse photography to present the details of mitosis. Portrays the basic features of meiosis by using lily anther cells and living sperm cells of a grasshopper photographed by time-lapse photography. Animation sequences give a side-by-side comparison of the two processes and show how mitosis, meiosis, and fertilization fit into the life cycle of common organisms.

772. Common animals of the woods (North America) (11:24)

Date:
1948
Summary:
Includes the squirrel, rabbit, raccoon, porcupine, otter, mink, beaver, opossum, skunk, ad woodchuck. In each instance the distinguishing characteristics of the animal are shown, such as the ability of the beaver to build a dam and the mother opossum's carrying her young on her back.

773. Protoplasm : the stuff of life (29:09)

Date:
1956
Summary:
In this program the audience hears a review and summary of all the information on the physical and chemical nature of living material discussed in previous programs. Dr. Roney uses sketch pad diagrams and models to picture the structure and organizations of living material, as it is understood today.

774. The woodcock (07:06)

Date:
1956
Summary:
Analyzes the characteristics, habits, and range of this elusive night-feeding game bird.

775. Trick and fancy roping (11:04)

Date:
1951
Summary:
Pictures the technique of plain and trick roping as it can be taught to children in schools and to patients in need of rehabilitative exercise. Includes a demonstration of a simple way to make a rope for roping.

776. They steamed to glory (22:09)

Date:
1962
Summary:
A documentary of the steam engine and the part it played in the westward expansion of the United States, from its earliest beginnings in 1831 when the John Bull was brought from England, to the last run of a mainline steam locomotive in 1960. Shows most of the historically important locomotives in action, and illustrates the development in design and increase in size and power over the years. Includes scenes of the race in 1831 between the Tom Thumb and a horse pulling a wagon, the Pioneer, the William Mason, and other famous engines and events of historic significance.

777. Formulas in mathematics (10:27)

Date:
1959
Summary:
Discusses how to simplify a mathematical word formula by restating it in letters and signs. Explains the mathematical formula for distance by graphic and pictorial examples and by practical application of the formula to problems in science and industry.

778. Hamburg, die hansestadt (09:52)

Date:
1958
Summary:
A map is used to locate Hamburg, Germany. Then tours the harbor section of the city and the business and shopping districts. Visits a typical middle-income home during a family gathering, the inner and outer lakes, the botanical gardens, and the zoo.

779. Home on the range (10:54)

Date:
1942
Summary:
Describes the productive power of ranchers and their role in supplying America's war effort during World War II. Portrays ranch life and western range country. Shows waterholes, windmills and watering tanks. Stresses improvements made through government range programs.