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Annexe L.
BACTERIOLOGICAL INSTITUTE.
REPORT BY DR. H. MACFARLANE, Bacteriologist.
THE PREPARATION OF CALF LYMPH.
Twenty-four calves (18 in 1910) have been vaccinated during the year. With the exception of one buffalo calf which died of Rinderpest, all the calves took apparently well and were subsequently slaughtered and declared healthy by the Colonial Veterinary Surgeon.
The lymph derived from these calves has been stored in the cold store (about 16° F.) and so far has not been required as all vaccinations done this year have been made with lymph prepared during 1910.
The method of cold storage recommended by Dr. Blaxall and Mr. Fremlin of the Local Government Board, England (see Report for 1910 p. 62) has been continued and has proved very satisfactory and economical.
A stock of lymph sufficient, presuming it to be all potent, for some thirty to forty thousand persons is now in the store.
Nine thousand eight hundred and two (9,802) tubes of lymph have been issued during the year compared with 7,997 in the year 1910.
A more satisfactory number of reports on the results of the free issues of lymph have been received this year, the total reports amounting to 7,880 compared with 1,092 in 1910. Table I summarises the chief points of these reports.
EXAMINATION OF RATS.
Tables II and III are compiled as in previous years. The total number of rats examined during 1911 was 65,927 compared with 56,001 during the year 1910.
BACTERIOLOGICAL EXAMINATION OF WATER.
Seventy-one samples of water have been examined during the year compared with 86 in 1910.
The majority of these samples were taken from the Public Water Supplies and the method of taking and working out of the samples was similar to that described in the 1910 Report.
Samples