The microscope and microscopical technology : a text-book for physicians and students / by Heinrich Frey ; translated and edited by George R. Cutter.

Date:
1880
Catalogue details

Licence: Public Domain Mark

Credit: The microscope and microscopical technology : a text-book for physicians and students / by Heinrich Frey ; translated and edited by George R. Cutter. Source: Wellcome Collection.

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

    574/684 (page 556)
    condition, and, with the employment of the familiar methods, the structure of the walls and the nature of the cells may be examined. Surface sections are of relatively less frequent necessity. Made through the upper portion of the epidermis, however, they are of importance for the ducts of the sudoriparous glands, and laid deeper on the border of the former towards the corium, for the study of the papillae. The primary examination of the sebaceous follicles (fig. 358) may be made on the labia minora, likewise on the skin of the scrotum, by picking fine sections with the needles and employing acetic acid. Good views may likewise be ob- tained, where the gland cells are not to be preserved, by means of dilute alkaline solutions. The dried integument of other portions of the body, by similar treat- ment, also shows the organs in the vicin- ity of the hair-follicles. Preparatory boiling in vinegar affords a good acces- sory for such skin. If it is proposed to examine the cells and the remaining con- tents of the sebaceous follicles, the skin is, according to Kolliker, to be previously softened ; then, with the epidermis, the hairs, with their root-sheaths and the cell masses of the sebaceous follicles, are often rendered very finely prominent, though, even here, hardening in absolute alcohol accomplishes more than all these old methods. The blood-vessels of the skin are to be examined on fine vertical and horizontal sections of transparently injected or- gans. In the papillse, at the point of the finger, an extensive natural injection is frequently met with, so that the transverse section of the dried skin, by the addition of a 30 to 40 per cent, solution of potash, affords very handsome views of the vascular loops. The puncturing method serves for injecting the lymphatic passages, which are likewise only enclosed by connective tissue (Teichmann). It is advisable to loosen the epidermis in water to which acetic acid and alcohol have been added, as directed by J. Neumann. In a very excellent work, that author used carmine with glycerine or carbonate of lead, rubbed up with Fig. 35S. A sebaceous follicle, a, the gland-vesicles; b, the excretory duct; c, the sac of a lanugo-hair; <1, the shaft of the latter.