Descriptive and Illustrated Catalogue of the Histological Series Contained in the Museum of the Royal College of Surgeons of England ...

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Seite 201 - Cellular flowerless plants, nourished through their whole surface by the medium in which they vegetate ; living in air; propagated by spores usually enclosed in asci, and always having green gonidia in their thallus.
Seite 177 - ... possessed a system of pores and vessels, through which sea-water passed, with all the appearance of the regular circulation of fluids in animal bodies, and for the seeming purpose of conveying animalcules to the animals for food. The description given of sponges by Dr. Johnston is, that...
Seite iv - ... MECS in 1840, and in the same year competed for and obtained the studentship in human and comparative anatomy, then recently established. "When the studentship expired in 1843 he became Assistant Conservator of the Hunterian Museum at the College of Surgeons ; in 1844 he was appointed by the Council " to deliver annually a course of demonstrations with a view to the exhibition and connected description of the collection, and the explanation of the method and resources of microscopical study.
Seite 3 - How are they produced?" In the " Histological Catalogue of the Royal College of Surgeons," Vol. i, p. 3, we are informed that it is by a "deposit of new matter on the external surface of the membrane." And that in the collection at the College (Ppn., A. 13) is " a preparation of the portion of a hair from the fornix of the corolla of Anchusa italica, exhibiting a deposit of tubercles of new matter on its external surface. Each tubercle contains two or more cavities, and a defined margin exists between...
Seite 22 - The arrangement of the reticulum varies considerably in different cells, and even in different parts of the same cell. Sometimes, for example (fig.
Seite 287 - ... 22° with the upper and under surfaces of the shell, and present the appearance represented in fig. 47, as seen with a power of 280 linear, the portion represented being the central layer of the shell. The planes of these plates of prismatic cellular structure are always as nearly as possible either parallel or at right angles to the lines of growth, and the mode of arrangement is invariable in each separate stratum, and always opposed to that of the stratum either above or below it ; so that...
Seite 285 - Gasteropoda are characterised by their being provided with a fleshy disc, serving as a foot, upon which to creep. The back is covered with a cloak, in or upon which the shell is secreted, and may consist of one or more pieces. All the shells are remarkable for the small amount of the animal as compared with that of the earthy matter, so that they are extremely brittle, and their fractured surfaces have...
Seite 287 - ... Upon submitting to examination a surface of this shell fractured at right angles to the lines of growth, it was found to consist of three distinct strata, uniform in the nature of their structure, but alternating in the mode of their disposition. Each stratum is formed of innumerable plates, composed of elongated, prismatic, cellular structure ; each plate consisting of a single series of cells parallel to each other. These plates of cellular structure are disposed alternately in contrary directions,...
Seite 89 - The ligament from which these specimens were taken, was upwards of eight pounds in weight, and six feet two inches in length ; on separating it from its several attachments to the spinous processes of the vertebrae, it immediately contracted to four feet.

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