MYALL.—Coal gas is an intensely poisonous vapour. Unlike the “choke-damp” of miners, which is carbonic acid gas, coal gas is not only irrespirable, but is actually poisonous. A very small quantity of gas in the air of a room may produce alarming results in anybody sleeping in the room. We are all familiar, at all events through the newspaper, with the immense danger of gas escaping into a bedroom. “How the body of —— was found in bed, and an escape of gas noticed,” etc. But few people are aware of the danger of a little gas escaping from a defective bracket or burner. Yet many cases of chronic failing health can be traced to this cause—gas escaping into the bedroom, often in such small quantities as to be undetected till searched for. Coal gas acts directly on the blood and destroys its function. When a person is found unconscious in a room in which gas is escaping, she should be immediately taken out into the open air and artificial respiration employed at once. But only too frequently no effort is of any avail. Charcoal burned with a limited supply of air gives out the same gas as the poisonous factor in coal gas, namely, carbon monoxide. This gas has no smell, and therefore it is not the poisonous constituent of coal gas which gives it the characteristic odour. Amongst the symptoms which may be met with in persons who sleep in a room into which a minute quantity of coal gas escapes, are headache, lassitude, especially in the morning, worrying dreams and anæmia. OLD MOTHER HUBBARD.—1. Sallowness of the complexion is one of the commonest symptoms met with in ill-health. Practically any form of illness may cause it. It is almost invariably present in chronic constipation.—2. Yes. One decayed tooth may injure every other tooth in the head, just as one rotten apple will spoil a whole sackful. Decayed teeth are not the least good to anybody; they cannot be used for mastication, and they are not beautiful. But they are exceedingly dangerous, and there are more deaths due to carious teeth than you would ever have suspected! The moral of this is obvious: decayed teeth should be removed or stopped at once.