. The Australian Museum magazine. Natural history. THE AUSTRALIAN MUSEUM MAGAZINE. 147 The Story of the Hookworm. By Dr. Wilbur A. Sawyer, Senior State Director International Health Board of the Rockefeller Foundation, and Director of the Australian Hookworm Campaign. [Abstj-act of a lecture delivered at the Australian Museum, April 13, 1922.] The hookworm is one of the nematodes, which on account of their shape are com- monly called thread worms or round worms. Their early ancestors doubtless lived in earth or water as the more primi- tive nematodes do to-day, but, with the lapse of time, thi
. The Australian Museum magazine. Natural history. THE AUSTRALIAN MUSEUM MAGAZINE. 147 The Story of the Hookworm. By Dr. Wilbur A. Sawyer, Senior State Director International Health Board of the Rockefeller Foundation, and Director of the Australian Hookworm Campaign. [Abstj-act of a lecture delivered at the Australian Museum, April 13, 1922.] The hookworm is one of the nematodes, which on account of their shape are com- monly called thread worms or round worms. Their early ancestors doubtless lived in earth or water as the more primi- tive nematodes do to-day, but, with the lapse of time, this class of worms became diversified and adapted to various en- vironments. Some made their home in decaying vegetation, others learned to penetrate living plants, and still others comprising a number of genera and spe- cies. Each species is parasitic in a spe- cial host; the dog, the cat, the sheep, the cow, the seal, the elephant, man, and doubtless many other animals, each have their particular species of hookworm parasite. Two species are parasitic in man, Necator amerioanus, the common hookworm of the tropical belt, the South- ern Hemisphere, and North America, and Ancylostoma duodenale, which predomin-. Hookworm demonstration at a country public school. Fart of the campaign is an effort to interest the children, who in turn become missionaries in the cause, and thus carry the pro paganda from home to home. Much good work has been done in this direction. acquired the power to live on the highly ates in northern Africa, northern India, nutritious tissues of living animals, or on the partly digested contents of their in- testines. Among the nematodes which are thus parasitic on animals are the hookworms. China, and Europe. In Australia, Neca- tor americanus is the commoner form, but there is a small admixture of the other, probably introduced from Europe, and both varieties mav be found in the same. Please note that these images are extracted from scanned page images that may
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