M 75
# EXAMINATION OF RATS
The results are given in Table I. The total number of rats examined was 88,896 compared with 82,715 in 1914. 22 were found to be Plague-infected (471 in 1914).
# BACTERIOLOGICAL EXAMINATION OF WATER
The three chief water supplies of the Colony (Kowloon, Tytam and Pokfulum) were examined quarterly and the results are given in Tables II, III and IV.
In every case the sample was taken at its source, i.e., either directly before or directly after filtration.
The methods used in carrying out the examinations were the same as those described in my Report on an Investigation of the Pokfulum Water Supply (No. 20 of 1911).
# INVESTIGATIONS
Mosquito Investigation.-In my last report I mentioned that 26,000 mosquitoes had been bred out, pinned and determined either locally or by the Imperial Bureau of Entomology and I gave a list of genera and species. Another 24,000 have now been dealt with in a similar manner bringing the total collection to not less than 50,000.
One species new to Hongkong-namely, Stegomyia fusca, Leic, has to be added to the list of species given last year.
The genus Stegomyia is now known to be represented in Hongkong by four species, namely, Stegomyia fasciata, Fab., Stegomyia fusca, Leic, Stegomyia Walk, Stegomyia W. alba, Theo.
## Stegomyia Fasciata
1. Kowloon-Further search for this species has confirmed the results given in my last report. I am of the opinion that Stegomyia fasciata is present in Kowloon in numbers which would be effective if yellow fever was introduced.
A visit to Kowloon during the summer months would always result in Stegomyia fasciata larvæ being freely taken in the stored drinking water in houses; it would not however be found in miscellaneous receptacles to any extent.
2. The City of Victoria.
(a) Miscellaneous receptacles. In my previous report I mentioned that Stegomyia fasciata had been taken only on three occasions in the miscellaneous receptacles in kitchen, backyards, etc. Over 36,000 visits have been made to examine these receptacles and I consider that for any practical purpose they may be regarded as not a breeding place of Stegomyia fasciata though they are very largely infected with Stegomyia scutellaris.
M 75
EXAMINATION OF RATS.
The results are given in Table I. The total number of rats examined was 88.896 compared with 82,715 in 1914. 22 were found to be Plague-infected (471 in 1914).
BACTERIOLOGICAL EXAMINATION OF WATER.
The three chief water supplies of the Colony (Kowloon, Tytam and Pokfulum) were examined quarterly and the results are given in Tables II, III and IV.
In every case the sample was taken at its source, i.e., either directly before or directly after filtration.
The methods used in carrying out the examinations were the same as those described in my Report on an Investigation of the Pokfulum Water Supply" (No. 20 of 1911).
INVESTIGATIONS.
Mosquito Investigation.-In my last report I mentioned that 26,000 mosquitoes had been bred out, pinned and determined either locally or by the Imperial Bureau of Entomology and I gave a list of genera and species. Another 24,000 have now been dealt with in a similar manner bringing the total collection to not less than 50,000.
One species new to Hongkong-namely, stegomyia fusca, Leic, has to be added to the list of species given last year.
The genus stegomyia is now known to be represented in Hongkong by four species, namely, stegomyia fasciata, Fab., stegomyia fusca, Leic, stegomyia, Walk, stegomyia W. alba, Theo.
Stegomyia Fascinta.
1. Kowloon-Further search for this species has confirmed the results given in my last report. I am of the opinion that stegomyia fasciata is present in Kowloon in numbers which would be effective if yellow fever was introduced.
A visit to Kowloon during the summer months would always result in stegomyia fasciata larvæ being freely taken in the stored drinking water in houses; it would not however be found in miscellaneous receptacles to any extent.
2. The City of Victoria.
(a.) Miscellaneous receptacles. In my previous report I men- tioned that stegomyia fasciata had been taken only on three occasions in the miscellaneous receptacles in kitchen, backyards, etc. Over 36,000 visits have been made to examine these receptacles and I consider that for any practical purpose they may be regarded as not a breeding place of stegomyia fasciata though they are very largely infected with stegomyia scutellaris.
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