PRESIDENTIAL ADDRESS. 53 
For the purpose of putting this matter beyond dispute, 
IT have had a list prepared of all the rats and mice sub- 
mitted for examination to the Microbiological Laboratory 
under my charge, from vessels berthing in the cosmopolitan 
port of Sydney between April 16th, 1913, and April 14th, 
BOT. 
During the period rats or mice were found on fumigation 
by the Commonwealth Department of Quarantine on 189 
vessels—of which eight are specifically designated barques 
—after the accomplishment of 325 voyages. I have no in- 
formation as to the number of instances in which neither 
rats nor mice were found. The ships belonged to all nation- 
alities, though naturally British vessels much predominated, 
whilst the voyages they had made included coastal, inter- 
state, and overseas in all directions. On the 325 voyages 
made by the 189 vessels, | 
Epvmys rattus was present in 2938, and absent in 32 in- 
stances. 
Epumys norvegicus was present in 3, and absent in 322 
instances. 
Mus musculus was present in 53, and absent in 272 in- 
stances. 
Epimys rattus was associated with H. norvegicus in 1, and 
with M. musculus in 22 instances. 
Epimys norvegicus was associated with EH. rattus in 1, 
and with M. musculus in 1 instance. 
Mus musculus was associated with EF. rattus in 22, and 
with H. norvegicus in 1 instance. 
2968 individuals of H. rattus were found and submitted, 
an average per voyage of 9. 
7 individuals of E. norvegicus were found and sub- 
mitted, an average per voyage of .02. 
487 individuals of Mus musculus were found and sub- 
mitted, an average per voyage of 1.5. 
