DESCRIPTION OF A TYPICAL QUEENSLAND LAGOON, (The Enoggera Reservoir, near Brisbane) With Methods of rendering the Water fit for a Town Supply. By HARDOLPH WASTENEYS, Analyst to Brisbane Board of Waterworks. Head before the Royal Society of Queensland, 5t/i Auytwt, 1905. Before commencing this paper and in order to prevent misunderstanding, I would like to state that I claim to be neither a Biologist — in the sense in which the term is used in connection with water — nor yet a Bacteriologist, consequently, in the descriptions and lists of the biological contents of the water which accompany this paper I have confined myself to the enumeration of the genera only, as the determination of the species is, as all know, a task which may only be success-fully accomplished by experts who have made a life study of the subject. Similarly, in the department of Bacteriology, I have confined myself entirely to quantitative estimations. The lagoon • under consideration, which is situated near Brisbane, is an artificial one, and was formed by throwing an embankment across the bed of a creek, the upper waters of which it receives. It has been in existence for nearly forty years. Its watershed has an area of 8,295 acres, for the most part heavily timbered, and covered in some places with fairly dense undergrowth. The catchment area is not fenced, but the lagoon itself is surrounded by a fence placed at a distance of 1 chain from the water's edge. There are practically no human habita-tions on the watershed, but cattle roam all over it at will. H
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