. The practice of medicine; a text-book for practitioners and students, with special reference to diagnosis and treatment . kets is derived from the old English word wrickken, to rickets was evidently known for some time by the laity before itreceived its description by F. Glisson, in 1650, who suggested the change ofname to rachitis from the Greek pax«, the spine. Etiology.—Rickets rarely begins before the child is six months old orlater than the age of 18 months, though a form was described by Sir WilliamJenner coming on as late as the ninth or even the twelfth year. Again, RICKETS
. The practice of medicine; a text-book for practitioners and students, with special reference to diagnosis and treatment . kets is derived from the old English word wrickken, to rickets was evidently known for some time by the laity before itreceived its description by F. Glisson, in 1650, who suggested the change ofname to rachitis from the Greek pax«, the spine. Etiology.—Rickets rarely begins before the child is six months old orlater than the age of 18 months, though a form was described by Sir WilliamJenner coming on as late as the ninth or even the twelfth year. Again, RICKETS 825 certain races tend to be rickety, especially the negro and the air and bad food, absence of sunlight and exposure to dampness andcold, are more potent factors, and it is likely that a defective compositionof the breast-milk, including a deficiency in the phosphates, is the fat and proteids seem deficient in those foods which favor thedevelopment of rickets. There is also a lack of assimilation of lime saltsin rickety children. Prolonged lactation may contribute to such Fig. 132.—Deformed Skeleton from a Case of Rachitis—(from Atlas du Musee Duputren). Poor feeding of infants with certain proprietary foods unquestionably causesrickets because of their deficiency in required constituents. Sterilized milk,and unhygienic siurroundings are fertile sotu-ces of the disease. It is a dis-ease of the city rather than of the country, and of the Continent of Europerather than of America. Vienna, London, and Paris are prolific fields. Inthe first-named cities from 50 to 70 per cent, of aU children brought to theclinics are said to be rickety. Parrot held that congenital rickets was aform of syphilis, basing this view on studies in the French capital. Probablyachondroplasia. Boys and girls are equally liable to rickets. 826 COXSTnUTIOXAL DISEASES Morbid Anatomy.— Minute examination recognizes numerous cells inthe spongy spaces in the b
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