PRESIDENTIAL ADDRESS. 99 
Domestic Fowls—Squamous epithelioma of the rump; 
squamous.epithelioma of the head; colloid carcinoma (?) 
of the peritoneal cavity. 
Muscovy Duck.—lLarge-celled sarcoma forming subcuta- 
neous nodules. 
Other Disease Conditions Met With. 
Enlargement of the Spleen.—I have previously’ called 
attention to an enlargement of the spleen, sometimes up 
to eight or nine times the normal size of the organ, in many 
of the rats on the wharves at Fremantle. Though the 
species affected was not recorded at the time, this was prob- 
ably E. norvegicus. Since then, in this species, a similar 
enlargement of the spleen has been noted in New South 
Wales. I am not prepared to say whether this hypertrophy 
is due to some chronic pathological process, or is a specific 
feature of the species concerned. 
Other disease conditions of our rats to which I have 
referred? are the following :—Ulceration of the feet with 
death in caged rats; dark pigmentation of the lymphatic 
glands; chronic abscesses in the groin, near the stomach, 
in the left side of the thorax, the neck, and the axilla; ecurdy 
pus in a uterine horn; pus round the sheath of the penis; 
the spleen studded with small white granules and the liver 
pale; peritoneal adhesions; calcified areas in the liver (3 
eases) ; infarct in the liver; subcutaneous dark-coloured 
areas on the abdomen; inversion of the uterus (2 cases) ; 
and cystic kidney. 
The following have occurred in New South Wales :— 
Fatty Infiltration of the Iwer—A very fat E. norve- 
gicus had a large friable liver mottled with bright yellow 
1 Aust. Assoc. Adv. Sci., Adelaide, 1907. 
2 Loc. cit.; Bull. Dept. of State Med. and P. Health, W.A., 1909, 
Nos. 10-12, p. 17. 
