W. Nicoll 
189 
5. In the presence of a properly organised sanitary system, intelli¬ 
gently utilised, there should be little or no risk of infection. It is the 
promiscuous distribution of excreta that is the chief source of the 
spread of infection. 
6. If the indiscriminate deposit of faecal material be not prevented, 
the matter resolves itself into a problem of considerable difficulty. 
7. The more commonly used disinfectants, if thoroughly employed, 
would render the faecal material comparatively innocuous, but their 
use is not less laborious than the proper removal of the faecal material 
and its disposal in properly constructed receptacles. 
8. Common table salt has a decidedly injurious effect upon the 
hook-worm eggs but it requires to be brought into very intimate contact 
with the infected material. The process of merely sprinkling the surface 
is almost' futile unless the salt be used in enormous quantities. 
9. 'When mixed with faecal matter, sand promotes the development 
of hook-worm larvae, but when used as a covering of a certain depth it 
arrests development. 
10. Exposure to direct sunhght of sufficient intensity kills hook 
worm eggs and larvae very rapidly. 
REFERENCES. 
Boycott, A. E. (1911). On Ankylostoma Infection. IVIilroy Lectures. Lancet, 
1911. March 18, 25; Apr. 1, pp. 65 et seq. 
Boycott, A. E. and Haldane, J. S. (1903). An outbreak of Ankylostomiasis in 
England. No. I. Joum. Hygiene, ni, 95-136, 5 pis. 1 fig. 
- (1904). Ankylostomiasis. No. 11. Ibid, iv, 73-111, 1 pi. 
- (1909). The Progress of Ankylostomiasis in Cornwall. Ibid, rx, 264-270. 
Fulleboen, F. (1914). Untersuchungen iiber den Infektionsweg bei Strongyloides 
und Ankyhstomum und die Biologic dieser Parasiten. Archiv fur Schijfs- und 
Tropenhygiene, xvm. Beiheft 5, pp. 26-80. 
Haldane, J. S. (1902). On an outbreak of Ankylostomiasis in a Cornish mine. 
Rept. to Secretary of State, Home Department. London, 8 pp. 2 pis. 
- (1903). On Ankylostomiasis in Westphalian Collieries. Rept. to Secretary of 
State, Home Department. London, 12 pp. 
Looss, A. (1905 and 1911). The Anatomy and Life-History of Ankylostoma duodenale. 
Dub. 451 pp. 19 pis. 
Nicoll, W. (1911). The Part played by Fhes in the Dispersal of the eggs of parasitic 
Worms. Rept. Local Govt. Board on Public Health and Medical Subjects. N.S. 
No. 53, pp. 13-30. 
Ransom, B. (1913). The Life-History of Habronema muscae (Carter), a parasite 
of the Horse, transmitted by the House-fly. U.S. Dept, of Agriculture, Bureau 
of Animal Indusiry. Bulletin 163, 36 pp. 
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