81. Day of the killer tornadoes (15:35)

Date:
1978
Summary:
Documents the series of 147 tornadoes which struck the South and Midwest sections of the United States in April 1974. Includes extensive footage of the tornadoes in Xenia and Cincinnati, Ohio and in Louisville, Kentucky. Shows how warning, advance preparation, and coordination in emergency operating centers helped to save many lives.

82. Defending the city's health (11:14)

Date:
1941
Summary:
Modern community hygiene controls are presented. How the death rate from communicable diseases has been reduced through scientific advances and social controls. The effective functioning of a public health department.

83. Defense of the Western hemisphere (16:56)

Date:
1951
Summary:
Traces the development of the Good Neighbor Policy, the Rio Treaty against aggression, and the Organization of American States set up at Bogota. Describes the importance to the Western Hemisphere of NATO and the U.N. military action in Korea. Stresses the economic interdependence of the American countries and the responsibility of the United States in the Western Hemisphere.

84. Defining primitivism (29:26)

Date:
1956
Summary:
Expands the popular definition of "primitive"--one who is self-taught--to include artists who reject academic or conventional expression, subject matter, or technique. Shows and discusses various examples of primitive art. (WQED) Kinescope.

85. Designing a set (10:10)

Date:
1951
Summary:
Describes each step in planning and designing a stage set. Shows how the realization of the set emerges from rough sketches and a scaled model.

86. Developmental genetics - I: a lecture by Dr. L. C. Dunn (29:40)

Date:
1959
Summary:
Portrays the role of developmental genetics in dealing with ways phenotypes come into being through the action of genes. Presents a complete discussion of the Creeper domestic fowl--its genetic basis, morphology, embryological history, and the experimental work that led to an understanding of how this gene affects early development to produce the morphological features seen as the outcome of the developmental process. Lecture given by Dr. L. C. Dunn.

87. 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 (pituitary dwarfism in the house mouse, lethal giant larva in Drosophila), or it may involve tissue induction systems (Brachyury and taillessness in the house mouse). Discusses the development of eye color in Drosophila as a model of how each of the steps in a chain of chemical processes leading to development is under genic control. Lecture given by Dr. L. C. Dunn.

88. Diary of a car thief (11:21)

Date:
unknown/unknown
Summary:
Follows a car thief, played by an actor, as he steals cars and offers recommendations to the spectator on how to protect their car. Includes footage of various people looking through documents, reenactments of cars being stolen and owners being upset when they realize what's happened, the process of car owner alerting police to theft, being interviewed by police, and police searching for the car; car being broken apart at chop shop; tips on what car owners can do to reduce the chances that their car will be stolen; women looking at microfilm machines; shot in and around Indianapolis; ends with car their behind bars.

89. 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.

90. 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 guides and other books to create interest in the English lake country. (BBC) Film.