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  • Open Daily: 10am - 10pm
    Alley-side Pickup: 10am - 7pm

    3038 Hennepin Ave Minneapolis, MN
    612-822-4611

Open Daily: 10am - 10pm | Alley-side Pickup: 10am - 7pm
3038 Hennepin Ave Minneapolis, MN
612-822-4611
A Guide to the Microscopical Examination of Drinking Water

A Guide to the Microscopical Examination of Drinking Water

MacDonald, J. D.

Paperback

General United States History

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ISBN10: 115227788X
ISBN13: 9781152277885
Publisher: General Books
Pages: 68
Weight: 0.25
Height: 0.16 Width: 9.01 Depth: 5.98
Language: English
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1875 Excerpt: ...marine. They consist of branched tubular filaments, frequently almost felted together in fine silky green tufts. The little granules of chlorophyll in the interior of the filaments are for the most part applied to the walls, embedded in a colourless protoplasm. Zoospores are formed in the club-shaped ends of the filaments. Unger observed that these bodies usually made their escape about eight o'clock A.m., at which time the process may be GENERA OP SIPHONACJE--ZYGNEMACE.E. 27 observed in healthy plants cultivated in fresh water. A true sexual mode of reproduction also exists in Vaucheria. Of the numerous species of this genus that have been described it would appear that only two or three are reliable. 2, portion more highly magnified; 3, reproductive organs; 4, a, b, and c, stages of development of the ciliated spore. (5.) Achlya prolifera is a small colourless plant, consisting of clavate erect tubular filaments springing from a myceliumlike minutely ramified base, closely applied to the bodies of dead flies in water, fish and frogs, upon which they grow parasitically. It was originally mistaken for the common fly fungus, or an aquatic form of Botrytis Bassiana, but more recent researches, rewarded by the discovery of ciliated zoospores, and of a perfect sexual system like that of Vaucheria, have dispelled these views and given the plant what would appear to be its true position. Apropos of the want of colour in this parasitic form, it will be noticed that Chytridium and Pythium, which are parasitic genera, in the preceding family, are also without colour. Family XII.--Zygnemacece. (Plate XII.) Plants consisting of cylindrical articulated filaments, with the green contents usually disposed in elegant patterns. Reproduction is effected by the phenomenon of...

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