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V. S. Government Films Sets of Slides UNLESS otherwise indicated the sets of slides listed and described in this catalog are black-and-white slides. Color slides are so identified. Each set of slides is described as follows: (a) the title of the set; (b) the name of the producing agency and the date of production; (c) the series title if the slides are part of a series; (d) a descriptive summary of the content of the slides; (e) references to related films; and (f) the order number of the set of slides if it has such a number, the number of slides in the set, the size of the slides, and special notations for color slides. Following these descriptive data are several numbers in bold-face type. These code numbers refer to specific instructions for obtaining Government slides which are explained on pages 306-329 of this catalog. To learn how to obtain the first set of slides listed below, for example, turn to page 312 where under code number 27, directions are given for borrowing these slides from the U. S. Public Health Service. Activated Sludge Process U.S. Public Health Service, 1950. (Munic- ipal Sewage Treatment Equipment and Structures Series No. 5) Operation of screen chamber, grit chamber, primary clarifier, aeration tanks, secondary clari- fiers, and other procedures in activated sludge process. Aerial and over-all ground views and graphic flow diagrams. (CDC-9-033.5; 41 slides, 2x2 in.) 27 Aquatic Plants Associated With Anopheles Breeding Areas U.S. Public Health Service, 1949. Aquatic plants found in environs of representative breeding places of Anopheles quadricu- latus, crucians and punctipennis in South- eastern states. Arranged according to sys- tem of Engler and Prantl. (CDC-5-092; 169 slides, color, 2x2 in.) .. 27 Cancer Nursing Slides U.S. Public Health Service, 1948. Post- operative care of cancer patient. Special procedures: nasal and gastrostomy feed- ing; dressings and care of tracheostomy; laryngectomy, mastectomy, colostomy, cystostomy, limb amputations; home transfusions; and handling radium and radon seeds. Procedure for breast self- examination. ( 100 slides, 2x2 in., also 3 l /ix4 in., accompanying script) 27 Chemical Precipitation Process U.S. Public Health Service, 1950. (Munic- ipal Sewage Treatment Equipment and Structures Series No. 3) Chemical pre- cipitation and stage digestion process in grit chamber and clarifier. Aerial and over-all ground views and graphic flow diagrams. (CDC-9-0333; 49 slides, 2x2 in.) 27 The Christmas Story in Paintings from the National Gallery of Art U.S. National Gallery of Art, 1949. The Christmas story as painted by the early 303