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closely packed corpuscles, about the size of, or a little larger than, 
the red corpuscles of human blood — its structure, in fact, exactly 
corresponding with that which is familiar to us in the foetal gland. 
Thus this animal gave us an additional illustration of the truth of 
the statement made by Haugsted and Simon, that the thymus is 
not merely a foetal structure, but that it plays an important part 
in the animal economy for some time after birth. 
The author considered that the close relation which was found in 
these porpoises between the thymus and thyroid glands, might be 
regarded as confirmatory of the view entertained by Professor Good- 
sir, that they are developed from a common structure. 
He next described a dissection of the thymus and thyroid, which 
he had made in an adult male Hartebeest ( Bubalus Caama). The 
thyroid in this animal was separated into two distinct lateral lobes, 
each lobe having connected with it a long slender glandular process, 
which passed down the sides and front of the trachea, behind the 
sternum, into the anterior mediastinum. These glandular processes 
exhibited microscopically the characters of the thymus, so that, both 
as regards structure and position, they must be regarded as consti- 
tuting that gland. 
The thymus and thyroid glands in the Nylghau (. Antilope picta ) 
were then described. The animal dissected was a magnificent 
specimen of an adult male, standing one foot above the recorded 
average height of the male. In it the thyroid was divided into 
two distinct lateral lobes, each lobe extending from the cricoid 
cartilage as far as the fourth tracheal ring. Situated on the an- 
terior surface of the trachea, and on the crico- thyroid membrane 
between these thyroidean lobes, were scattered lobules of glandular 
tissue of a slightly reddish tint. These were not connected with the 
thyroid, but were lying in the cellular tissue between its lobes. 
Similar scattered lobules extended for some distance down the trachea, 
but about thirteen inches above the sternum they became aggregated 
together, so as to form two long lines of glandular tissue, which 
passed beneath the sternum into the anterior mediastinum. Structur- 
ally this gland presented the character of the thymus. It corre- 
sponded also to it in position. In addition to the proper gland 
structure, the microscope brought into view numerous three-sided 
prismatic crystals, resembling those of the triple phosphate, lying 
in and about the connective tissue of the gland. 
