7 2 



VASCULAE GLANDS. 



(sect. 32. 



zu den Nervenfasern, Leipzig, 1847. Ch. Eobin, in T Inst., 1846, Nos. 687— 

 690; and 1848, No. 733. Kolliker, Ncurologische Bemerkungen, in Zeitsch. 

 f. wiss. Zool., i. p. 1 3 5. 



5. Tissue of the Vascular Glands. 



§ 32. Under the name vascular glands are comprehended a 

 series of organs whose common character consists in this, that they 

 prepare, from the blood or other juices in a special glandular tissue, 

 certain matters which are not conveyed away by special permanent, 

 or occasionally-formed excretory ducts, hut simply by transudation 

 from the tissue, and are then employed, in one way or another, for 

 the purposes of the organism. Although this very general defi- 

 nition may include organs which it will, perhaps, be necessary 

 hereafter to separate, yet, owing to our very defective knowledge 

 of these structures, it seems to be the only one possible, without 

 too much anticipating the special discussion of them. 



The essential glandular tissue of the organs in question presents 

 itself in the following forms : 



1. As a parenchyma of larger or smaller cells, embedded in a 

 stroma of connective tissue. Supra-renal capsules, anterior lobe of 

 the pituitary body. Here the cells attain crc^'", and more in size ; 

 and then contain, besides a granular mass, numerous nuclei and 

 secondary cells. 



2. As closed follicles, with an envelope of connective tissue and 

 contents consisting of nuclei, cells, and some fluid. To this division 

 I reckon : 



a. The solitary follicles of the stomach and intestine; and 



b. The aggregated follicles of the small intestine, or the patches 

 of Peyer (in animals, also, of the stomach and large intestine), 

 both of which contain numerous blood-vessels in the interior of 

 the follicles. 



c. The follicular glands of the root of the tongue, the tonsils, and 

 the pharyngeal follicles, which contain, in the walls of their cavities, 

 numerous shut follicles like the above-mentioned, and probably, 

 also, having vessels in their interior. 



d. The lymphatic glands, the glandular parenchyma of which 

 consists of round follicles, similar to those of the Peyerian glands, 

 but opening into each other, and directly connected with the 

 lymphatic vessels. 



3. As a cell-parenchyma, supported by trabecule of connective 

 tissue, containing, like the above, numerous closed follicles. Spleen. 



The chemical nature of these more or less vascular organs is 



