. The analysis of food and drugs . 29 Synedra pulchella (28) ; Synedra ulna (29).—Both thesediatoms are said to cause a disagreeable grassy taste andsmell in water. Fungi. The moulds, Mueor mucedo (30), Aspergillus (31), andPenicillium glaucum, are not to be regarded as naturalinhabitants of water, since they do not multiply Their natural habitat is moist decaying organic matter, andtherefore their presence in water is objectionable. Ccelenterata. Hydra vulgaris (32).—This organism is characteriptic ofstagnant water. MICROSCOPIC EXAMINATION 29

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