606 
MR. E. C. BABER ON THE STRUCTURE OF THE THYROID GLAND. 
blue by the method of puncture, but the injection had not penetrated into 
this branch of the lymphatics), hardened in alcohol and stained with haema- 
toxylin, showing a portion of the walls of two adjacent vesicles with the 
intervening structures seen in transverse section. (Obj. F, oc. I.) 
1 , 1 . Epithelial walls of two vesicles. 
2 , 2 . Cavities of ditto. 
3, 3. Small branch of lymphatic running between the two vesicles. The nuclei 
of some of its endothelial cells are seen. 
4 , 4 , 4 . Capillaries situate between the lymphatic and the epithelial cells. 
This drawing also shows certain points at which the lymphatics are not 
separated from the epithelial cells by capillaries. 
Fig. 10. From a section of the thyroid gland of the Tortoise, uninjected, hardened 
in alcohol and stained with hematoxylin. Section of a vesicle containing 
homogeneous material, with indented edges, embedded in which are nume¬ 
rous red blood-corpuscles partly separate and partly fused together to form 
a ball in the centre of the vesicle. Epithelium drawn semi-diagrammatically. 
(Obj. F, oc. I.) 
Fig. II. Section of another vesicle from the same thyroid gland as the preceding, 
prepared in like manner. The vesicle contains, embedded in the homo¬ 
geneous material, several large round nucleated cells (colourless blood- 
corpuscles). Epithelium semi-diagrammatic. (Obj. 8, oc. I.) 
Fig. 12. From a longitudinal section of the thyroid gland of a Dog (female, aged 
7 or 8 years), uninjected, hardened in alcohol and stained with picro- 
carminate of ammonia. Numerous vesicles are seen in section, almost all of 
which contain in addition to the usual homogeneous material a greater or 
less number of partly disintegrated red blood-corpuscles. The epithelium, 
which is somewhat flattened, probably from the effect of the re-agents, is 
represented diagrammatically. (Obj. 6, ocs. I. and III.) 
PLATE 69. 
Fig. 13. From a transverse section of the thyroid gland of a Dog (male, aged 
3 months), uniniected, hardened in alcohol and stained with hsematoxylin. 
(Obj. F, oc. I.) 
1. Epithelial wall of a vesicle, which at— 
2 . 2 . Contains numerous yellow pigment granules. At the right-hand lower 
corner the epithelium is cut somewhat obliquely, so that its inner margin is 
not w T ell defined. In the interior of the vesicle are seen numerous red 
blood-corpuscles. 
3 . Portion of the wall of an adjacent vesicle also containing many red blood- 
corpuscles. In this epithelial wall are likewise seen numerous pigment 
granules. 
