The education appears to be confined simply to head-work, and no provision is made for sustaining the health by physical training, while it is in danger of exhaustion by a cerebral stimulus, perhaps applied for the first time in the history of the family from which the child has sprung. It is true that cerebral disease forms only a small part of the school mortality; but the diseases from which the mortality proceeds in the tropical schools are {14} the result of overcrowding, defective ventilation, and other local sanitary evils, all of which are augmented by sedentary occupation. The remedy for this is obviously to improve the school-houses, to give more attention to space, to ventilation, and to the locality where the school is placed, and above all to make physical training an essential and important part of the school system, never forgetting that the habits of generations cannot be suddenly broken through without danger to health and life. In as far as concerns the effect of the schools on the disappearance of native races, the returns contain no appreciable evidence. Education, if properly conducted, together with the improved personal, physical, and moral habits consequent on it, ought everywhere to be conservative and not destructive; but to be so it should be conducted, as already stated, with a full knowledge of the physiological effects of altered habits and the influence of these on health. The hospital returns, so far as they can be relied on, show in the tropical colonies a large mortality from diseases arising from bad drainage, bad water, imperfect agriculture, want of cleanliness, and from other bad habits. Bad, overcrowded, unventilated dwellings must also in these colonies, as at home, bear their proportion of the blame. Thus mortality arising from mitigable or preventible causes of an external nature occasions in all the colonies by far the greatest part of the death rate in hospitals. Incivilization with its inherent diseases, when brought into contact with civilization without adopting specific precautions for preserving health, will always carry with it a large increase of mortality on account of the greater susceptibility of its subjects to those causes of disease which can to a certain extent be endured without as great a risk by civilized communities born among them.