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Moths 600 Useful arts 610 Medicine 611 Anatomy 612 Physiology 612.1 Blood and circulatory system 612.2 Respiration 612.3 Digestion 612.76 Locomotion 612.78 Voice 613 Hygiene 613.2 Food. Dietetics 613.4 Cleanliness 613.9 Sex education. Social hygiene 614 Public health 614.8 Safety 614.84 Fire protection and prevention 616 Pathology. Diseases 616.2 Diseases of the respiratory sys- tem 616.24 Tuberculosis 617.6 Dentistry. Care of the teeth 617.7 Care of the eyes 617.8 Care of the ears 619 Veterinary medicine 620 Engineering 621 Mechanics and machinery 621.1 Steam engineering 621.3 Electricity. Applications 621.31 Generation of electricity 621.312 Central stations 621.32 Electric lighting 621.35 Storage batteries 621.38 Electric communication: radio 621.385 Telephone 621.4 Gas and oil engines. Solar en- gines 621.5 Pneumatic machinery. Refrig- eration 621.8 Principles of mechanism 621.87 Elevators 621.9 Machine tools 622 Mining engineering 622.2 Quarrying 622.33 Coal mining 623 8 Naval architecture 623.825 Submarines 624 Bridges 625 Railroad and road engineering 625.7 Roads. Highways 626.8 Irrigation 627.8 Dams 628 Sanitary engineering 628.1 Water supply engineering 628.3 Sewage disposal 628.7 Rural water supply 628.9 Lighting 629.1 Aeronautics 629.2 Automobiles 629.213 Safe driving 630 Agriculture 630.942 Agriculture in England 630.952 Agriculture in Formosa 631 The farm 631.18 Marketing of farm produce 631.4 Soils 631.5 Farm operations 632 Hindrances. Pests 632.6 Injurious animals 632.7 Injurious insects 633 Field crops 633.1 Cereals. Grains 633.3 Beans 633.5 Textile fibers 633.8 Hops 634 Fruits. Orchards 634.1 Apple 634.3 Citrus fruits 634.5 Peanuts 634.7 Small fruits 634 9 Forestry 634.909 Civilian conservation corps 634.92 Forest fires 635 Gardening 635.2 Potatoes 635.3 Cabbages 636 Domestic animals 636.1 Horses 636.2 Cattle 636.29 Camels 636.3 Sheep 636 4 Swine 636.5 Poultry 636.59 Ducics. Turkeys 636.7 Dogs 636.9 Fur-bearing animals 637 Dairy and dairy products 639 Fisheries 640 Home economics 641.5 Cookery 649 Nursing. Care of children 650 Business 652 Typewriting 653 Shorthand 655 Printing 658 Business methods 660 Chemical technology 662 Fuels. Explosives 662 2 Explosives 663 Beverages 664 Food 664.1 Sugar 664.2 Tapioca 664.4 Salt, 664.6 Baking powder 664 8 Preservation of fruits and vege- tables 664.9 Preservation of meat IX