Dr. Barron, among a series of experiments, confined a number of young rabbits in a close damp situation; many of the animals died at intervals varying from five to seven weeks from the time of their incarceration. On the removal of the survivors to dry localities, which were otherwise favourable to health from being well ventilated, their condition soon became manifestly improved. This fact has been further confirmed by the experiments of Sir James Clark and Dr. (now Sir Robert) Carswell and Dr. Jenner. In a report of the sickness which occurred among the Edinburgh Police, as drawn up by the medical attendant, the effects of an ill-ventilated station-house are noticed. It furnishes an additional example, if such were needed, of the importance of pure air and plenty of it. The men boarded and lodged in this place were originally the healthiest and youngest men in the force; yet the rate of sickness among them was very high, as was also the mortality--being more than treble that of the other part of the force located elsewhere. Out of thirty-seven men occupying the house in question, only one was found to be free from functional disorder: the prominent symptoms being great sensibility to atmospheric changes, copious cold perspirations, a constant sense of fatigue, with pain in the eye-balls and loss of appetite. It would appear that in all propositions for sanitary improvements, the all-engrossing topic is--the noxious properties of stinking vapours. The cesspools and sewers seem to be the chief object of solicitude, even in legislative proceedings; as though there were no deleterious gases surrounding our globe, inappreciable to the olfactories, and yet of far more consequence in a sanitary point of view. Now, although vapours arising from cesspools and imperfect drainage unquestionably constitute one of the many predisposing causes to disease, they are not of such paramount importance as ventilation; for their noxious influence, from whatever source they may arise, depends more or less on their existence in open or confined places. The indefatigable Parent Duchâtelet, in his work on ‘HYGIENE PUBLIQUE,’ has shown that stenches, filthy exhalations, however disgusting, are not necessarily the cause of disease, when not pent up, as _à priori_ they might be supposed to be. He informs us that at one of the most extensive ‘Chantierres d’Equarrissages,’ situated at Montfauçon, within a mile or two of Paris, occupying a large open space of ground, where thousands of horses, dogs, and cats are taken yearly to be slaughtered, and where almost all the ordure of Paris is collected together, the most abominable stenches are to be met with: the ground, saturated with the blood of the slaughtered animals, sends forth a most disgusting fœtor, as do also the enormous mounds of putrid flesh collected for the purposes of manure, and for the generation of maggots for feeding poultry! Yet the workmen living