LIST OF VISUAL AIDS 671 



Life Cycle of Moss (MP, UWF, 10 min). Reproduction of mosses, showing produc- 

 tion of sex organs, gametes and fertilization, growth of sporophyte, spore production, 

 and protonema. 



Life in a Pond (MP, Coronet, 10 min). A class field trip to a pond, where plants 

 and animals ranging from microscopic to the size of fishes are seen and their food 

 chain relationships noted. 



Life through the Ages (FS, Macmillan, 49 fr). Shows how plants and animals have 

 left a record of their past in the fossils which are examples of life in the Paleozoic, 

 Mesozoic, and Cenozoic eras. 



A Lost World (MP, EBF, 10 min). Glimpses into the world of dinosaurs and pre- 

 historic monsters. Based on a story of the same title by A. Conan Doyle. 



Marine Animals and Their Food (MP, Coronet, 10 min). Food supply and food- 

 getting adaptations of marine animals, illustrative of contents of pages 550-553 and 

 565-576. 



Meiosis — In Spermatogenesis of the Grasshopper, Psophus stridulus (MP, Brice, 

 19 min). Scenes of living cells, primary and secondary spermatocytes going through 

 prophase, metaphase, anaphase, and telophase cycles. 



Muscles (MP, EBF, 15 min, silent). Nature, structure, and use of muscles, con- 

 traction, fatigue, arrangement in antagonistic groups. 



Nine Basic Functional Systems of the Human Body (MP, Bray, 11 min). Shows by 

 animated drawings the skeletal, muscular, excretory, circulatory, nervous, sensory, 

 digestive, lymphatic, and endocrine systems of the human body. 



Plant Physiology (FS, Macmillan, 47 fr). Shows the parts of a plant; traces the 

 flow of water through the plant ; and illustrates food-making and respiratory activities 

 and various kinds of tropism. 



Plant Reactions (MP, Academy, 11 min). Shows through time-lapse photography 

 the reactions of plants to water, light, gravity, and chemicals. 



Plant Survival (MP, UWF, 10 min). Shows the protective devices of plants by means 

 of close-up photographs of roots, seeds, buds, leaves, and flowers. 



Protoplasm — The Beginning of Life (MP, Bray, 15 min). Traces through the study 

 of geology the earliest forms of life, and explains their characteristics of movement, 

 irritability, assimilation, and reproduction. 



The Protozoa (MP, EBF, 27 min, silent). Life of various Protozoa, including means of 

 locomotion, food getting, reproduction, waste elimination, and reactions to environ- 

 ment. 



Pygmies of Africa (MP, EBF, 20 min). Life and customs of Pygmies of the Ituri 

 Forest, showing the dominance of food-gathering activities in their primitive 

 society. 



Reactions in Plants and Animals (MP, EBF, 10 min). A study of reactions to stimuli. 



Reptiles (MP, EBF, 14 min, silent). Characteristics and adaptations of various 

 species. 



Rodents (MP, ICS, 10 min). Covers many types of rodents, including the lago- 

 morphs, and may be useful in connection with the section on taxonomy. 



Root Development (MP, UWF, 9 min). Shows by photomicrography the details of 

 root structure and growth, and by animation the moisture absorption of roots. 



Seashore Oddities (MP, YAF, 20 min, color). Marine invertebrate life, including 

 many species of each of four phyla — coelenterates, echinoderms, arthropods, and 

 molluscs, with good discussions of their characteristics, food habits, and reproduction. 



Sea Urchin (MP, UWF, 18 min). Life history of the sea urchin, with special reference 

 to it early embryology. 



Tiny Water Animals (MP, EBF, 10 min). Protozoa and small metazoan inhabi- 

 tants of water, shown by photomicrography. 



