First lines of physiology, being an introduction to the science of life; written in popular language . soft cellulartissue in and by which thebone was originally preparing a bone thus re-duced with spirit of turpentine,it may be rendered so tran-sparent that you can read abook through its thickness. 164. The changes thus ef-fected by art, are often accom-plished in the living body bydisease. There is a very ter-rible affection sometimes seenin Europe, but scarcely everin this country, which reducesail the human bones nearly tothe condition of gristle, so thatthey will bend with the w
First lines of physiology, being an introduction to the science of life; written in popular language . soft cellulartissue in and by which thebone was originally preparing a bone thus re-duced with spirit of turpentine,it may be rendered so tran-sparent that you can read abook through its thickness. 164. The changes thus ef-fected by art, are often accom-plished in the living body bydisease. There is a very ter-rible affection sometimes seenin Europe, but scarcely everin this country, which reducesail the human bones nearly tothe condition of gristle, so thatthey will bend with the weightof the body or the limbs, until the unfortunate patientbecomes horribly deformed and finally dies. In scro-fulous or cancerous complaints, a part or the whole ofa particular bone may be reduced nearly to simple cel-lular tissue;—and in consequence of this change, I haveknown a person to break an arm by simply turning inbed. In a few rare instances, the gristle and earthymatter have been restored by the vital powers after suchan alteration. 165. From v/hat has been already said of the struc-. Bone deprived of earthy matter. t- 88 APPARATUS OF MOTION. ture of muscles and bones, you are now prepared forthe statement of a general truth, which I introduce inthis place in order to avoid the necessity of frequentrepetition. Every part of the body of an animal, andconsequently every organ that it contains, is composed,in part, of cellular tissue : after death, it may be reducedby art to the condition of simple cellular organ not essential to life may undergo this changein consequence of disease, and may be restored by thevital powers to its former condition. 166. This membrane, which, as you have been told,seems to form the entire body of the simplest animals,such as the hydra (65), is really the instrument by whichall the organs are created. There is a time in the historyof every animal before birth, when the body is composedentirely of cellular membrane, and is as
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