School Hygiene, Or, The Laws of Health in Relation to School Life

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D.C. Heath, 1889 - School hygiene - 143 pages
 

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Page 31 - ... same temperature as the external air. Such methods have, however, but a limited application in the northern United States. During a large portion of the year, in order to prevent dangerous draughts, the incoming air requires warming. When the external temperature reaches 60, or better still 65, the air may be freely admitted. Open windows are by far the best means of ventilation, and during the school recess all the windows should be thrown open, opposite windows if possible, or doors and...
Page 65 - It is not the knowledge stored up as intellectual fat which is of value; but that which is turned into intellectual muscle.
Page 107 - Three chief defects of vision occur in children ; in the first, (hypermetropia) ; in the second, the rays of light are brought to a focus in front of the retina...
Page 63 - Blimber made him bear to pattern, somehow or other. This was all very pleasant and ingenious, but the system of forcing was attended with its usual disadvantages. There was not the right taste about the premature productions, and they didn't keep well. Moreover, one young gentleman, with a swollen nose and an excessively large head (the oldest of the ten who had " gone through" everything), suddenly left off blowing one day, and remained in the establishment a mere stalk.
Page 65 - ... full play, the other, whose vital energies have been more directed towards increase of size, is relatively incomplete in structure; and shows it in a comparative awkwardness, bodily and mental. Now this law is true of each separate part of the organism, as well as of the whole. The abnormally rapid advance of any organ in respect of structure, involves premature arrest of its growth; and this happens with the organ of the mind as certainly as with any other organ. The brain, which during early...
Page 108 - ... slightly blue-tinted, so as to soften the glare of the white page in reading. Colored glasses should not be too dark in tint, lest it require too much exertion to see clearly through them. In near-sight, as we have seen, the eye is too full, so that rays of light from a distance are brought to a focus before reaching the retina. (See Figure F.) The exercise of the accommodative or adjusting power of the eye is of no use, or even worse than useless, because, when brought into service, its function...
Page 78 - ... more than two years, both taller and heavier than boys at the same age, though before and after that period the reverse is the case. Table No. 3, giving the annual rates of growth, shows the same thing in a different way. Here we see, in the column of totals, that the greatest annual increase in height occurs for girls at 12 and for boys at 16 years of age, while the maximum increase in weight is for boys at the same age and for girls one year later than the maximum increase in height. Similar,...
Page 30 - The air in a room is warmed by the inmates and by the stove, gas, or other source of artificial heat. Cold air tends to rush in from every opening, and, being heavier than warm air, falls toward the floor, producing a draught. The great problem of ventilation is to secure a sufficient interchange of air without causing draughts. The entrance of air at any temperature below 50 into a room whose temperature is 65 or even 70 is almost certain to be accompanied by a draught ; hence it is necessary...
Page 78 - ... 3. At about twelve and' a half years of age girls begin to grow faster than boys, and, during the fourteenth year, are about one inch taller than boys of the same age. " 4. At fourteen and a half years of age boys again become the taller, girls having at this period very nearly completed their growth, while boys continue to grow rapidly till nineteen years of age.
Page 113 - Cohn proposes that the type of ordinary journals should be 4 millimeters or \ inch in height, though M. Javal thinks it may be allowed to be 2 millimeters. The thickness of down and up strokes, the spaces between letters and words and between lines, and the length of lines all require attention. Letter-press derived from a worn-out fount gives an imperfect impression of the letters. The loops of a and e, of b dp g are apt to form a black spot ; long letters become broken, and fine up strokes are...

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