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HISTOLOGICAL NOTES. 115 
nected with the duct of the parotid of the dog. Heidenhain 
(‘ Hermann’s Handbuch d. Physiologie,’ V Band, p. 25) says 
that in the parotid gland (of the dog) he met with alveoli 
lined with mucous cells, but, he adds, this occurrence is not 
frequent. 
2. Passing from the parotid along the inner side of the lower 
jaw we meet with a large gland, of a pale rosy colour, compact, 
oval, or rather pear-shaped, and holding the position of the sub- 
maxillary gland of other mammals. Its length is 15—20 mm., 
its breadth in the part nearest the parotid is much greater than 
that of the other end, in the former being about 10 mm., in the 
latter about 5 mm., its thickness is about 5 mm. Now, the 
structure of this gland coincides neither with that of the parotid 
of this or other animals, nor with that of the submaxillary 
gland of other mammals, for it is identical with that of the 
pancreas. 
Boll (‘Archiv f. Mikr. Anat.,’? Band v), describes the submaxillary 
gland of the guinea-pig as a mixed gland, 7.¢., its alveoli are in some 
places lined with mucous cells, in others with protoplasmic cells like 
those of the parotid. Lavdowsky (‘ Archiv f. Mikr. Anat.,’ Band xiii, p. 
286) denies this, but neither here nor on the following page (287), on 
which he gives a tabular classification of the various salivary glands of 
man and mammals, does he say of what nature the submaxillary of the 
guinea-pig is. 
The alveoli are branched and convoluted tubes showing great 
inequality im size; their very minute lumen is lined with a 
single layer of colmmar or pyramidal cells, in each of which, 
just as in the pancreas, can be distinguished an outer and an 
inner zone ; the former contains the spherical nucleus, and stains 
well in hematoxylin and carmine, while the latter looks granular 
and transparent, and does not stain. The former, 7. e¢. the outer 
part, contains rod-like structures, which in some cells are very 
much coarser than in others. These rods are arranged longi- 
tudinally, and are distinct only near the membrana propria. I 
do not find, however, the centroacinar cells of Langerhans. The 
structure of the intralobular ducts is the same as in the sub 
maxillary gland. 
It will be of great interest to inquire whether the secretion 
of this gland is similar to that of the pancreas. 
Close to the outer capsule of the gland is found occasionally 
a minute oval lymph-follicle, ensheathed in its own connective- 
tissue capsule; its long diameter is about 0°6 mm., its breadth 
0:18 mm. The surface of the lymph-follicle is not smooth, 
being notched-in at two or three places. 
Attached to the posterior, or rather inner margin of the sub- 
maxillary gland, but contained within its own connective-tissue 
