6 7 



the old site and around the house occupied by Madame Musso I 

 found them breeding in hundreds. As this is the history extending 

 over years, and as the facts conform accurately to the prevalence of 

 Anopheles and malaria, it would afford strong presumptive evidence 

 of the distance travelled by mosquitoes over an infected area. 



5. MOUNT RICHMOND. 



One of the finest private residences in the Colony, originally costing 

 130,000 dols., was sold for something like 25,000 dols. At the request 

 of the owner I examined this district, and from the report sent to him 

 I read the following : 



" The history you gave me of the various buildings and the pre- 

 valence of malaria was most instructive, and from it alone I felt sure 

 that there must be some breeding pools in the immediate vicinity, but 

 I hardly expected to find them so close to the building and so localised. 

 I have to-day taken nearly a hundred larvae of Anopheles from a single 

 pool within 80 yards of your house. I have no hesitation in saying 

 that you could not be without fever, and that this fully explains why 

 for years the district has had a fever-stricken name." 



Why is it that within 50 yards of this property, separated by a 

 road and a clear space, other houses were free from malaria, and the 

 inhabitants lived for years in comparative immunity ? The cause and 

 effect are so distinctly marked out that I was fully justified in promis- 

 ing the owner a permanent and effective cure which would greatly 

 enhance the value of his property at a comparatively small cost. 



6. TAI-PO POLICE STATION. 



The following extracts from a report, dated Hong Kong, Novem- 

 ber i;th, 1900, by Drs. J. M. YOUNG and JOHN C. THOMSON gives 

 the results of an inquiry into the causation of the prevalence of 

 malarial fever at Tai-po : 



We have the honour to report, for the information of His Excellency 

 the Governor, that in accordance with His Excellency's instructions 

 we proceeded to Tai-po for the purpose of inquiring into the causation 

 of the marked prevalence of malarial fever there recently. 



*.**** 



We made careful search in all directions around the Government 

 buildings and matsheds for breeding places of Anopheles. From the 



