Experiments and observations in order to ascertain the means employed by the animal economy, in the formation of bone / by John Howship.

  • Howship, John, 1781-1841.
Date:
1815
Catalogue details

Licence: Public Domain Mark

Credit: Experiments and observations in order to ascertain the means employed by the animal economy, in the formation of bone / by John Howship. Source: Wellcome Collection.

Provider: This material has been provided by Royal College of Physicians, London. The original may be consulted at Royal College of Physicians, London.

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    formed a mass by their cohesion, may be consi- dered as an assemblage of the finest and thinnest fibres, moulded into the form of short tubes, ar- ranged nearly parallel to each other, and opening externally upon the surface connected with the cartilage. These tubes appeared to correspond in their number to the villi noticed in the last exami- nation. They presented at the surface the appear- ance of numerous foramina, similar to the smaller set exhibited in Fig. 4. The larger set of foramina seen on the same surface, apparently corresponded in number and situation to the canals already de- scribed as existing at an early period in the cartilage, and extending into the bone beyond the surface of ossification. jExam. 7. In order to observe the changes that occur towards the latter periods of growth, sec- tions were taken from the lower end of the thigh- bone; these were selected from subjects of va- rious ages, and the following were the appearances under the microscope. In a child eleven months old, the canals within the cartilage were very few in number. At the age of four years these canals were still more thinly scattered, and those that were observed were of comparatively small diameter. When the sections became partially dry, aline one-sixteenth of an inch in breadth, was seen towards the margin of ossifi- cation, where the particles of the cartilage had