146 THOMPSON YATES LABORATORIES REPORT 
It is interesting to note that samples 1 and 2 were subsequently eaten by the laboratory 
attendants without ill effect. 
The pork butchers unfortunately decline to give any information concerning 
the genesis of the saveloy. Probably, however, they are made from the intestines 
of the pig, and from odd scraps of meat which have been exposed to dust and dirt, 
and consequently the presence of enteritidis spores in them is not extraordinary. 
Since the epidemic, 1895, the spores of bacillus enteritidis have been frequently 
discovered in milk. Klein isolated them from eight out of ten samples of milk, 
bought in 'various quarters' of London,* and Hewlett from eight out of fifteen 
samples. f Andrewes examined the milk supplied to St. Bartholomew's on six con- 
secutive days, with positive results on five occasions. t Samples of milk sold in 
Liverpool have been systematically examined in this laboratory during the last 
fourteen months. About 10 c.c. of each sample were placed in sterile test tube, 
heated to 8o° C, for a quarter of an hour and incubated anaerobically. At first the 
resulting enteritidis-like cultures were tested upon guinea-pigs. Out of twenty-one 
inoculations the virulence was normal in nine instances, and diminished in five, four 
were pathogenic but not fatal, and two were non-pathogenic. Thus the results of 
inoculation proved that enteritidis bacilli were present in eighty-six per cent, of the 
enteritidis-like cultures, and forty-two per cent, were of normal virulence. 
* Medical Officer's Report, Local Government Board, 1897-98, p. 236. 
t Transactions of the Jenner Institute of Preventive Medicine, second seri 
+ Lancet, January 1899, p. 9. 
