. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 1090 THYMUS GLAND. rope, on which the lobes and lobuli are set somewhat like the beads on the string of a necklace (Jig. 721.). By injecting also the glandular cavities with some fluid, as alcohol, capable of hardening the tissue, or with co- loured gelatine, which sets and permanently distends them, he demonstrated the existence of a central cavity or reservoir, communicating with the glandular cavities by orifices leading into pouches situated at the roots of the lobes (Jig. 122.). The central cavity forms a Fig.
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 1090 THYMUS GLAND. rope, on which the lobes and lobuli are set somewhat like the beads on the string of a necklace (Jig. 721.). By injecting also the glandular cavities with some fluid, as alcohol, capable of hardening the tissue, or with co- loured gelatine, which sets and permanently distends them, he demonstrated the existence of a central cavity or reservoir, communicating with the glandular cavities by orifices leading into pouches situated at the roots of the lobes (Jig. 122.). The central cavity forms a Fig. Section of thymus showing the reservoir, cells, and pouches. {After Sir A. Cooper.} general communication between the different lobes ; it does not maintain a straight course, but passes in a somewhat spiral manner, be- ginning from the lower part of the thoracic portion, and extending even into the extremity of the cervical part of the gland : its size varies in different parts, being largest near the centre of the thoracic, and least at the communication of the thoracic with the cervical, part of the gland. Sir A. Cooper conceived the reservoirs to be lined by a very vascular mucous mem- brane of somewhat villotis character, but this does not appear in reality to exist. Such were the principal results obtained by a most skilful and eminent anatomist, with all the appliances and aids that his science could at that day supply; they were truly valuable facts, but not so " luciferous," not so exhibit- ant of physiological meaning, as those ob- tained by a subsequent inquirer, who, availing himself of the more penetrating ken of the modern achromatic lens, and seeking rather to learn from the instructive examples which Nature herself sets forth, than from results of his own devising and producing, has both confirmed the conclusions drawn from a less refined scrutiny, and invested them with a more correct bearing and interpretation. I refer, of course, to the admirable
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