Experimental and practical researches on inflammation, and on the origin and nature of tubercles of the lungs / [William Addison].

  • Addison, William, 1802-1881
Date:
1843
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Licence: Public Domain Mark

Credit: Experimental and practical researches on inflammation, and on the origin and nature of tubercles of the lungs / [William Addison]. Source: Wellcome Collection.

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    the Blood/’ printed in the Philosophical Transactions for 1840 and 1841. According* to the statements of this observer, he has found every tissue which he has examined “ to arise out of corpuscles having the same appearance as the corpuscles of the blood.” From the nature of the subjects especially en¬ gaging my attention, viz., tubercle, tubercular infiltrations, and hepatization of the lungs, I have pursued a course of investigation different from that of Dr. Barry. I find all the varieties of epithelial cells and pus corpuscles to arise out of the colourless corpuscles of the blood, so far confirming Dr. Barry’s conclusion ; and I further find, that the morbid depo¬ sits above mentioned appear to have the same origin. Before I proceed to give an account of my own researches, it will be necessary to make a few preliminary remarks upon the terms used by Dr. Barry to designate the minute objects seen in the interior of the blood corpuscle, which he calls “dark objects,” “the foundations of future cells,” but for which I have retained the terms “ molecules” and “granules.” The microscopic powers I have used magnify 250 and 500 diameters linear ; and all subsequent descriptions have reference to objects as they appear with the former power, unless the contrary be expressly stated. Black spots (a, plate 1, fig. 1) on a white ground, having a diameter of only Ain., are distinctly visible to a person with a good sight, when held at the