CATALOG 1952-1953 ATY. 305.-Celestial Navigation. 3 hours. 3 credits. Prerequisite: MS. 105 or its equivalent, and some science background. Offered 1. The geographical and astronomical principles and practices involved in determina- tion of position at sea and in the air, and in the guidance of marine vessels and air- craft. Topics studied include charts, the compass, dead reckoning, piloting, nautical astronomy, navigational instruments, the navigator's work at sea. ATY. 306.-Celestial Navigation. 3 hours. 3 credits. Prerequisite: ATY. 305. The second half of the course ATY. 305-306. Offered 2. ATY. 316. (Formerly ATY. 405).-General Astronomy. 3 hours. 3 credits. Prerequisite: MS. 105 or its equivalent. Offered 1. A survey of the astronomical universe; the earth as an astronomical body; solar system, including a special study of the sun and moon. Occasional observation periods. ATY. 317 (Formerly ATY. 406).-Advanced General Astronomy. 3 hours, and 2 hours laboratory. 4 credits. Prerequisite: ATY. 316. Offered 2. Consideration of the planets as to distances, orbits, diameters, masses, rotations, and satellite systems; and introduction to astro-physics. BACTERIOLOGY Instructional Staff 1951-52 Tisdale, W. B., Chairman, Division of Botany; Carroll, W. R., Emerson, R. L. BCY. 301.-General Bacteriology. 2 hours, and 4 hours laboratory. 4 credits. Prerequisites: C-6, or equivalent; CY. 121-122, or CY. 109-110. BCY. 301 or equivalent is prerequisite to all advanced courses. Offered 1, 2, 3. Morphology, physiology and cultivation of bacteria and related microorganisms. Frobisher, Fundamentals of Bacteriolgy, 5th Ed. BCY. 302.-Agricultural Bacteriology. 2 hours, and 4 hours laboratory. 4 credits. Offered 3. Bacteria and associated microorganisms in relation to water, milk, silage and farm problems. BCY. 304.-Pathogenic Bacteriology. 2 hours, and 4 hours laboratory. 4 credits. Offered 2. Recognition, culture, and special laboratory technique of handling pathogens and viruses; theories and principles of immunity and infection. Jordan & Burrows; Text of Bacteriology. 13th Ed. BCY. 306.-Bacteriology of Foods. 2 hours, and 4 hours laboratory. 4 credits. Offered 1. Relation of bacteria yeast, molds and other microorganisms to preservation and spoilage of foods. Tanner, Microbiology of Foods, 2nd Ed. BCY. 308.-Sanitary Laboratory Practice. Offered 1. 1 hour and 4 hours laboratory. 3 credits. Corequisite: CY. 215. Problems in sewage and public sanitation, designed primarily for sanitary engineers. American Public Health Association and American Water Works Association, Standard Methods for Examination of Water and Sewage, and Gainey, Microbiology of Water and Sewage. The statement "Offered 1" means offered first semester; 2, second semester; 3, summer session.