Theory

principles of a science. Also, a reasonable supposition or a umption, generally one that is better developed and more probable than a mere hypo i' T., Cohnheim's (of Inflammation). See Samuel's. T., Darwin's. See Darwin ism , Evolution. T., (of In flam tn See T, Landerer's. T., Hammarsten's; that I coagulation of the blood is due to the of a substance called fibrinogen, which is di i in the blood-plasma. This decomposition is brought about by the agency of the fibrin -ferment, which is tin product of the disintegration of the colorle corpu The most important product of this action is the com paratively insoluble material called fibrin. T.. Lamarckian; the doctrines based upon the teachings of the French naturalist, J. B. P. A. de Monet marck, who attempted to explain tb gre ive evolution of nature by virtue of an inheren. tendency to development and the efforts excited by.ge of conditions. T., Landerer's ing inflammation is much lower than under normal iitions. The capillaries surrounded by these imed ti ues are unable to withstand the pre ure he blood and, therefore, dilate. The immediate of this dilatation is an acceleration of the move it of the blood, which rushes in to fill the widened illaries. But after a certain lapse of time, as the unding ti ues lose their elasticity more and more, lood-stream slows, thus producing the condition of the circulation typical of inflammation, i Metschnikoff s Biologic or Comparative " inflammation generally must be rded as a phagocytic reaction on the part of the iism against irritants. This reaction is carried out he mobile phagocytes, sometimes alone, sometimes with the aid of the vascular phagocytes or of the nerammantial phenomena of inf i The e e rn t an M-.e esen. actual struggle between the phagon repr the irritant agent." T., Paralytic (of tes and on); the doctrine that regards hyperemia fiammati the most e ential act in inflammation, and caused paralysis of the vasomotor nerves. T. of Peptogeny and Pep toge no us Substances of Schiff and Corvisart: this theory adduces the noteworthy peculiarity whereby the secretory ti ues of the stomach yield gastric juice only when in contact with certain alimentary substances, because these substances furnish i an indispensable element in the production of pepsin. T..