UNIVERSITY OF FLORIDA FY. 415.-Timber Physics and Timber Structures. 2 hours, 3 hours lab- oratory and conference. 3 credits. Prerequisite: FY. 309 and MS. 253. Of- fered 2. Basic principles involved in analysis of timber and plywood structures; basic principles used in testing wood specimens; basic design of timber and plywood structures. FY. 416.-Forest Management Working Plans. 1 hour, and 5 hours in field. 3 credits. Prerequisite: FY. 419. Application of principles of Forest Management in making working plans for spe- cific forest areas, beginning with the school forest working plans; measures for sustained yield, increase or reduction of growing stock. FY. 418.-Logging and Lumbering. 3 hours. 3 credits. Utilization of major forest products; logging engineering, transportation, equipment, costs, lumbering manufacture, plant, milling practice, and merchandising products. FY. 419.-Principles of Forest Management. 3 hours. 3 credits. Principles of forest management, forest organization, management plans, sub- divisions of forest area, forest regulations, cutting cycle, normal forest, etc. FY. 420.-Forest Economics and Administration. 3 hours. 3 credits. A world survey of forest resources; land economics as applied to forestry; supply, demand, price trends and forest net income, forest taxation, public and private forest administration. FY. 421.-Kiln and Air Drying of Lumber. 1 hour, and 4 hours labora- tory. 3 credits. Prerequisite: FY. 309. Offered 1, 2. Principles and practices of wood storage, stacking, air seasoning, kiln drying and schedules, temperature and moisture relations. FY. 431.-Forest Problems Seminar. Lecture, field and laboratory work arranged. Variable credit. Offered 1, 2. Discussion of and investigation in some particular field of Forestry or wildlife management. The student will be assigned to the member of the staff in whose field his interest lies. FY. 434.-Applied Wildlife Management. 1 hour, and 6 hours of field work. 3 credits. Prerequisite: FY. 354. Offered 1. The application of wildlife management techniques to the production of annual crops of wildlife. FY. 435.-Applied Wildlife Management. 1 hour and 5 hours field. 3 credits. Prerequisite: FY. 434. A continuation of FY. 434. The application of wildlife management techniques for the production of annual crops of wildlife. FY. 436.-Waterfowl Management. 2 hours, and 3 hours of laboratory or field work. 3 credits. Prerequisite: FY. 353 and approval of instructor. The problems and principles concerned with the conservation and management of waterfowl populations. FY. 439.-Naval Stores. 1 hour lecture. 3 hours field. 2 credits. Woods practice, factors influencing oleoresin yields, distilling practices, integration with other forest uses. The statement "Offered 1" means offered first semester; 2, second semester; 3, summer session.