The Pedestrian's Record

the pedestrian's record. 10/ spired ; and therefore oxygen is not present in the lungs in sufficient quantity to unite with the carbon existing in the blood to form carbonic acid, and the consequence is, the circulating arterial blood contains carbon in excess, and the brain becomes affected, owing to the fact that a too highly carbonized blood is determined to that organ. In the next place, it will be our humble endeavour to explain how nerves, being paralyzed or involved in dis­ eased action, produce a baneful effect on parts:— Firstly, mechanical injury produces local inflamma­ tion. Scarcely an individual lives who has not noticed around the edges of a wound caused by the cut of a penknife an inflammatory blush. This state is brought about by mechanical injury to the nerves of the part, when by direct impression their integrity is lost, their action impaired, and so they cease to exert their all- necessary influence upon the coats of adjacent blood­ vessels, and the consequence is that local inflamma­ tion is manifested. Secondly, the mechanical application of pressure causes congestion. The long-continued and repeated pressure of the saddle or collar impairs nervous power and creates inflammation, noticed in the sore neck and galled back of colts during the period of breaking. In these cases nature often effects a cure by hardening or thickening the cuticle or outer skin. By long-continued exertion on hard roads inflamma­ tion of the feet is brought about, noticed in laminitis, an equine disease affecting horses' feet.