DECIMAL CLASSIFICATION 
513.7 
JI 
72 
73 
M4 
75 
76 
77 
78 
79 
8 
1 
82 
83 
84 
.85 
.86 
8% 
88 
89 
G 
C 
Q2 
93 
QA 
Hygiene of Recreation and Sleep. 
Gymnastics. See also 371.73, School Hygiene, Care of Body 
For Curativ gymnastics, see 615.82, Massage. 
Athletics and other Muscular Exercise. 
See also 796, Out-door sports. 
Training and Overstrain. See also 371.75, Championship games, 
Amusement or Play. 
See also 796, Out-door sports, and 371.74, Recreations. 
Parks. 
Some subjects more properly placed in Public Health, ar groupt here by 
attraction. 
Vacations. See also 371.23, School Vacations. 
Holidays. See also 371.23, School Holidays. 
Rest and Sleep. Late Hours. See 613.86, Insomnia. 
Hygiene of Nervous System. 
[ncluding the action of Stimulants and Narcotics. See also 615.78, Drugs 
acting on Nervous System; 615.95, Neurotic Poisons. 
For Mental overwork, see 131, Mental Hygiene. See also 178, Temperance 
Alcohol. See also Temperance, 178; Beverages, 613.3; Inspection of Bever 
ages, 614.34. 
Opium and Hashish. See also 178.8. 
Chloral and Caffeine. See also 178.8. 
Tobacco. See also 178.7. 
Other Narcotics. 
Insomnia. See also 613.79, Rest and Sleep. 
Morbid Habits. Bad Social Customs. See also Social Ethics, x77; 
Late Hours, 613.79. 
Luxury. Privation. 
See also Fasting; Famine; Starvation, 613.24 
Celibacy. Monogamy. Polygamy. 
See also Polygamy and Monogamy, 173.2; Sexual Ethics, 176; Celibacy of 
Clergy, 254; Asceticism, 248. 
Hygiene of Offspring. Heredity. 
See also Heredity, 575.1. 
Congenital Defects of Body. 
See also Monstrosities, 573.9; and Orthopaedic Surgery, 617.3. 
Inherited Mental Disability. 
See also Mental heredity, 136.3; Mental derangements, 132; and Mental 
physiology and hygiene, 131 
Transmitted Disease. 
See also special diseases in 616. 
Stirpiculture. Eugenics.