A new system of midwifery : in four parts : founded on practical observations ; the whole illustrated with copper plates / by Robert Wallace Johnson, M.D.

  • Johnson, Robert Wallace, 1719 or 1720-
Date:
1786
Catalogue details

Licence: Public Domain Mark

Credit: A new system of midwifery : in four parts : founded on practical observations ; the whole illustrated with copper plates / by Robert Wallace Johnson, M.D. Source: Wellcome Collection.

Provider: This material has been provided by The University of Glasgow Library. The original may be consulted at The University of Glasgow Library.

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    be feen, but by opening the breaft and lower belly. And by the .twenty-firft day, the pullus is perfect. Malpighius fupplies us alfo with an accurate defcription of this APPfn- <je affair, illuftrated with curious cuts; from which, for the fake of bre- vity, I fhall only felett fig. 4. plate I. fig. 18. plate II. fig. 22. plate III. and figures 31. and 32. plate IV. together with a few of his obfervations which feem moft ufeful on the prefent fubjed:; and likewife fhew that this great man difcovered the rudimental parts of the pullus much earlier than the celebrated Harvey did : as for in- Page 2. ftance, in a fruitful egg, not fat upon, he obferved the upper part of the carina of the chick. In an egg, after the month of July, that had been fat upon by an Indian hen fix hours, above three-fourths of the carinawere vifible. After twelve hours incubation, the cicatricula increafed to the fize p]ate IV~ fig. 1. A j in the center of which, the colliquamentum B, was obferved with the carina, which delineated by white zones, marked out a little round head and beyond the middle, firft exhibited the orbicular veficles of the vertebras C, Handing out here and there : yet this ftrudure was moft frequently covered by the little bag D ; this was fucceeded by a white circle like E, which, on the outfide, was encompafied by a copious rivulet of the colliquamentum F next to this was extended the umbilical area G, which was wafhed by a broad rivulet H. To thefe were fometimes added more frnall circles I, carried round in the fame manner. After thirty hours, the circles of the cicatricula were obferved to be multiplied, loofened and broken. The umbilical area A, was Fi „ covered with fmall varicous veffels B, which were encompafied with elated folid portions of a palifii fubftance : the colour of the veflels was firft yelky, and afterwards rufty. In the fame area the veficle C was contained. The young, living in the colliquamentum, obtained fuch a configuration. In the head, where there were obferved dou- ble