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21. Developmental genetics - II: a lecture by Dr. L. C. Dunn Columbia University (29:41)

Date:: 1959
Summary:: Describes the ways in which genes produce phenotypic differences by acting very early in embryonic development. Shows that this action may take place at a distance through chemical messengers (pitu...

22. Diffusion And Osmosis (30:18)

Date:: 1962
Main contributors:: Columbia Broadcasting System

23. Digestion, part 1 [mechanical] (17:48)

Date:: 1950
Main contributors:: Winifred Cullis; Gaumont-British Instructional Ltd.; Beryl Denman Lacey
Summary:: Uses animation to show the mechanical and muscular processes involved in the digestion of food. Includes the absorption of digested food, water, and salts into the blood and the function of the liver.

24. Digestion, part 2 [chemical] (20:18)

Date:: 1950
Main contributors:: Winifred Cullis; Gaumont-British Instructional Films; Beryl Denman Lacey
Summary:: Uses animation to demonstrate the chemical processes of digestion. Shows the chemical breakdown of foods, the structure and functions of the glands involved, the absorption of digested foods, and t...

25. Directing a play (11:21)

Date:: 1951
Summary:: Introduces problems which arise in the presentation of a play and shows how the director solves them.

26. Discovery Of A Landscape-English Lakes (30:55)

Date:: 1956
Summary:: Shows through readings, paintings, and natural photography the development of the portrayal of English lakes and landscapes by painters, poets, and others. Depicts the printing of illustrated tour...

27. Distance races (10:04)

Date:: 1938
Main contributors:: Erpi Classroom Films; Lawson Robertson; Dean Cromwell
Summary:: Includes races from 1,000 to 10,000 meters and steeplechase. Style of distance runner contrasted vividly with that of dash man. Differences in typical physiques. Steeplechase portrays various met...

28. Distributive education (16:00)

Date:: 1955
Summary:: Portrays the nature and the role of the Distributive Education Program in the state of Virginia in preparing students for possible future jobs. Shows ow personality traits of an individual provide ...

29. Diversity of plants, no. 6 : the bryophytes (28:06)

Date:: unknown

30. DNA structure and replication (29:15)

Date:: 1959
Main contributors:: University Films; J. D. Watson; Irwin H. Herskowitz
Summary:: Describes RNA and DNA which are favored as the carriers of genetic information. Presents DNA molecules as shown in the electron microscope and describes the polymeric nature of the DNA molecule and...