. [Scientific lectures]. uite an adulteration, but, under favorable circumstances, that is, with warmth and moist-ure, I have seen one-half the bulk, at least, animal life. Thiswould, however, only be the case upon small lots of in barrels, their number is frequently immense, but theyare much more plentiful at the top of the barrel, or nearest thelight, though light is in no way necessary to their production. The disease known as grocers itch, is undoubtedly due tothe presence of this mite, which may now and then work itsway under the skin of the hand. Plentiful as these mites are o
. [Scientific lectures]. uite an adulteration, but, under favorable circumstances, that is, with warmth and moist-ure, I have seen one-half the bulk, at least, animal life. Thiswould, however, only be the case upon small lots of in barrels, their number is frequently immense, but theyare much more plentiful at the top of the barrel, or nearest thelight, though light is in no way necessary to their production. The disease known as grocers itch, is undoubtedly due tothe presence of this mite, which may now and then work itsway under the skin of the hand. Plentiful as these mites are on the damp brown sugars, I havenever detected them on dry white sugar, though I almost alwaysfind them on figs, dates, honey, if grained, and often on thecomb when not; in fine, they may be found on all sweet sub-stances that are sufficiently exposed. They are a jolly, playful race of beings, and seem to live andeat for enjoyment; when frightened they play dead, curling uptheir legs, and remaining inactive for some 69 Another singular mite, and of the lowest order, burrows in theskin of dogs, and also in the diseased follicles of the human face, and more especially the nose of .JicA^*^ man. (See Fig. 37.) It is a long, slen-^ ai^wiilloi^^^^ der, wormlike form, with eight short Fig. 37. legs, though like many other mites it has but six in the larvalstate. Washing the face in water to which has been added oneteaspoonful of strong aqua ammonia to the quart, will usuallyremove them. WATER ANIMALCULES. Perhaps no class of objects that are visible to us only throughthe microscope engage our attention so often, or amaze us somuch, as the various forms and peculiar habits of the wateranimalcules. For the first time it is an amazing spectacle to view an as-semblage of dissimilar forms in a drop of stagnant are from one thousandth to one ten-thousandth of an inchin diameter, and I once saw them so crowded that the spacesbetween them were not much larger. Several hundred
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