XXX.—POSITION OF THE HOUSE 201 XXXI.—THE MATERIALS USED IN THE CONSTRUCTION OF A HOUSE 205 XXXII.—CONSTRUCTION OF THE HOUSE 209 XXXIII.—THE SOIL 219 XXXIV.—CLIMATE AND WEATHER 227 XXXV.—METEOROLOGICAL OBSERVATIONS 237 XXXVI.—PERSONAL HYGIENE 245 XXXVII.—PERSONAL HYGIENE—EXERCISE 249 XXXVIII.—PERSONAL HYGIENE—REST AND SLEEP 257 XXXIX.—PERSONAL HYGIENE—CLEANLINESS 260 XL.—CLOTHING 265 XLI.—PARASITES 273 XLII.—THE RÔLE OF INSECTS IN SPREADING DISEASE 281 XLIII.—INFECTIVE DISEASES 284 XLIV.—ACUTE INFECTIVE DISEASES 291 XLV.—TUBERCULOSIS 309 XLVI.—NOTIFICATION AND ISOLATION 317 XLVII.—DISINFECTION 324 XLVIII.—VITAL STATISTICS 335 _SPECIAL TABLE OF CONTENTS FOR ARITHMETICAL PROBLEMS IN HYGIENE._ PAGE PROBLEMS IN MILK ANALYSIS 12 „ „ DIETETICS 35 „ „ WATER ANALYSIS 86 „ „ AIR ANALYSIS 126 „ AS TO VENTILATION 137 „ „ FLOW IN SEWERS 187 „ IN METEOROLOGY 242 „ AS TO WORK 254 „ IN VITAL STATISTICS 336 HYGIENE. CHAPTER I. INTRODUCTORY. In classical mythology, Æsculapius was worshipped as the god of Medicine, while his daughter Hygeia had homage done to her as the sweet and smiling goddess of Health. The temples of these two deities were always placed in close contiguity; and statues representing Hygeia were often placed in the temple of Æsculapius. In these statues she is represented as a beautiful maid, holding in her hand a bowl, from which a serpent is drinking—the serpent typifying the art of medicine, then merely an art, now establishing its right more and more to the dignity of a science. That considerable attention was paid in very early times to matters relating to health, is also shewn by the elaborate directions contained in the Mosaic law as to extreme care in the choice of wholesome foods and drinks, in isolation of the sick, and attention to personal and public cleanliness. It is not surprising, therefore, to find that the Jews, throughout the whole of their history, have apparently enjoyed a high standard of health.