74 | J. B. CLELAND. 
From 1904 to 1910, 674 infected individuals of this species 
were recognised, located at Sydney, Newcastle, Ulmarra and 
Woodford Island. In Queensland, in 1904, 1905 and 1906 
(vide Ham’s Report , p. 131)—the only years apparently in 
which the requisite data have been published—there were 
412 infected FH. norvegicus. Dr. Borthwick informs me that 
in Port Adelaide in 1909 all the rats found infected, 6 in 
number, were of this species. Total, 1092. 
E. rattus.—In New South Wales, for the period mention- 
ed, 580 FH. rattus were found infected, all being from New- 
castle or Sydney. In Queensland the number for the three 
years 1904 to 1906 was 186. Total, 716. 
Mus musculus.—Whilst 257 infected mice in New South 
Wales were found at Sydney, Newcastle, Ulmarra, Wood- 
ford Island, Ballina and Lismore, only 4 altogether were 
found in Queensland. Total, 261. 
Other Animals.—4 cats were found infected in New South 
Wales, at Sydney, Woodford Island and Ballina. A list 
already given shows that in Sydney, in 1902, 4 wallabies, 
1 wallaroo, 1 pademelon, 1 tree kangaroo, 1 Indian ante- 
lope and 3 guinea-pigs contracted plague naturally in the 
Zoological Gardens. 
Rat Leprosy. 
What is known as rat leprosy has been recorded from 
various parts of the world, including Australia (Sydney, 
Melbourne, Adelaide). A severely affected rat loses the 
hair on the back and adjacent parts of the limbs, and this is 
accompanied with much thickening of the skin and sub- 
cutaneous tissues, and frequently with small areas of super- 
ficial ulceration. When sections are made of these tissues 
they are found to contain countless millions of the acid- 
fast bacilli of rat leprosy. Sections stained as for tubercle 
bacilli may appear deep red from their abundance—in fact, 
