566 
MR. E. C. BABER ON THE MINUTE ANATOMY 
nothing, any clue likely to throw some light on this subject is of value ; hence my reason 
for introducing the above remarks, which are, of course, still in a large degree conjectural. 
It will be very interesting to examine the thyroid gland in other animals, and to 
investigate more closely the nature of this peculiar material, subjects which I propose 
to pursue. 
The above research was made at the suggestion, and under the direction, of Dr. Klein, 
to whom I wish to return my best thanks. 
Explanation of the Plates. 
PLATE 47. 
Fig. 1. From a transverse section of the thyroid gland, injected with Berlin blue and 
stained with picrocarminate of ammonia. (Verick’s obj. 6, oc. I.) 
a. Lumen of an artery, seen in transverse section. 
b. Cross section of a large lymphatic vessel that surrounds it. This is seen 
filled with a granular material, stained yellow in the specimen. The dark 
outline indicates the position occupied by the Berlin -blue injection. 
c. Contents of the vesicles, which present a similar appearance to b. 
d. Walls of gland-vesicles, the epithelial cells of which are flattened by 
the action of the reagents. 
Fig. 2. Small lymphatic tubes and spaces injected with Berlin blue, from a longitudinal 
section of the thyroid gland. Hardened in Muller’s fluid and alcohol. 
(Obj. 6, oc. I.) 
Fig. 3. A more general view of the lymphatic tubes and spaces, from a similar specimen. 
In this preparation the tubes appear somewhat shrunk by the action of the 
reagents. (Obj. 2, oc. I. Tube drawn out.) 
Fig. 4. Lymphatic tubes showing endothelium, from a transverse section of the gland 
injected with nitrate of silver. In this specimen, which is rather thick, the 
tubes, which in the drawing appear on one level, are situated on various 
planes, and frequently dip down among the vesicles. (Obj. 3, oc. III.) 
Fig. 5. From a transverse section of the thyroid gland injected with nitrate of silver. 
a. Interior of a large lymphatic cut across. 
Punning across its cavity is seen an artery ( b ) which is surrounded by the 
endothelial wall of the lymphatic. This endothelial layer is also seen investing 
the outer surface of the neighbouring vesicles. The structure of these is only 
represented at one part ( c ). (Obj. 3, oc. III.) 
PLATE 48. 
Fig. 6. From a transverse section injected with silver, showing lymphatic tubes sur- 
rounding a group of vesicles and giving off smaller branches. The endothelial 
