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16 페이지 - Get some clean, fine sand ; dry it thoroughly in a kettle on the stove. Make a bag about eight inches square, of flannel, fill it with the dry sand, sew the opening carefully together, and cover the bag with cotton or linen.
68 페이지 - Hence we may infer as highly probable that, if the whole genus of humblebees became extinct or very rare in England, the heartsease and red clover would become very rare, or wholly disappear.
92 페이지 - Myriads of minute worms were developed in the animal charcoal, and passed out with the water, when these filters were used for Thames water, and when the charcoal was not renewed at sufficiently short intervals. The property which animal charcoal possesses in a high degree, of favouring th« growth of the low forms of organic life, is a serious drawback to its use as a filtering medium for potable waters.
68 페이지 - But on looking closely between the stems of the heath, I found a multitude of seedlings and little trees which had been perpetually browsed down by the cattle. In one square yard, at a point some hundred yards distant from one of the old clumps, I counted thirty-two little trees; and one of them, with twenty-six rings of growth, had, during many years, tried to raise its head above the stems of the heath, and had failed.
53 페이지 - ... tint. To produce the former, it is only necessary to wash the article with a solution of sal-ammoniac ; a much more beautiful tint may, however, be obtained by employing a solution composed of equal parts of sulphate of copper and sal-ammoniac in vinegar. The fine black tint may be produced...
11 페이지 - It is not only that the pure science of human life may match with the largest of the natural sciences in the complexity of its subject-matter ; not only that the living human body is, in both its material and its indwelling forces, the most complex thing yet known, but that in our practical duties this most complex thing is presented to us in an almost infinite multiformity. For in practice we are occupied, not with a type and pattern of the human nature, but with all its varieties in all classes...
39 페이지 - ... 5. It is a good practice to rinse the mouth out after every meal. 6. All rough usage of the teeth, such as cracking nuts, biting thread, etc., should be avoided, but the proper use of the teeth in chewing is good for them.
71 페이지 - This proportion is 3 parts of water to 2 of gum, both by weight. 2. That the relation of oil to gum (and water) shall be definite within certain limits ; that is to say, the mucilage formed in the above proportions is capable of perfectly emulsifying a minimum and a maximum proportion of oil. The minimum proportion is 2 parts of oil to 1 of gum ; the maximum proportion is 4 of oil to 1 of gum.
111 페이지 - In one of these respiratory intervals I now sit doune to write to you, my friend. " You ask me how, with so much study, I manage to retene my health. Ah, my dear doctor, you have a better opinion of your lazy friend than he hath of himself. Morpheous is my best companion ; without 8 or 9 hours of him yr correspondent is not worth one scavenger's peruke. My practizes did at ye first hurt my stomach, but now I eat heartily enow as y' will see when I come down beside you.