Biology for Beginners

الغلاف الأمامي
H. Holt, 1921 - 558 من الصفحات
 

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الصفحة 412 - Could the young but realize how soon they will become mere walking bundles of habits, they would give more heed to their conduct while in the plastic state. We are spinning our own fates, good or evil, and never to be undone. Every smallest stroke of virtue or of vice leaves its never so little scar. The drunken Rip Van Winkle, in Jefferson's play, excuses himself for every fresh dereliction by saying, 'I won't count this time!
الصفحة 413 - Well! he may not count it, and a kind Heaven may not count it; but it is being counted none the less. Down among his nerve cells and fibers the molecules are counting it, registering and storing it up to be used against him when the next temptation comes. Nothing we ever do is, in strict scientific literalness, wiped out. Of course, this has its good side as well as its bad one. As we become permanent drunkards by so many separate drinks, so we become saints in the moral, and authorities and experts...
الصفحة 413 - I won't count this time." Well ! he may not count it, and a kind Heaven may not count it ; but it is being counted none the less. Down among his nerve cells and fibers the molecules are counting it, registering and storing it up to be used against him when the next temptation comes.
الصفحة 413 - Let no youth have any anxiety about the upshot of his education, whatever the line of it may be. If he keep faithfully busy each hour of the working day, he may safely leave the final result to itself. He can with perfect certainty count on waking up some fine morning to find himself one of the competent ones of his generation, in whatever pursuit he may have singled out..
الصفحة 437 - A healthy mental attitude implies many elements, but they are all roughly summed up in the word "serenity." Probably no other one hygienic requirement is of greater importance than this. Moreover, the attitude of "healthymindedness" should be striven for not only in order to produce health, but as an end in itself, for which, in fact, even health itself is properly sought. In short the health of the body and the health of the mind act and react on each other.
الصفحة 359 - Salts. — These are found in milk, green vegetables, fruit, cereals made from the whole grains and egg yolks. Regulating Foods. — 1. Mineral Salts. — These minerals which have been mentioned as repair foods, are also regulating foods, and help to keep the body machinery running properly. 2. Water. — Water is an important regulating food. Many people drink too little. Six glasses of water a day is the average requirement — one between meals and one at meals. 3. Ballast or Bulk. — This is...
الصفحة 521 - Whereas, We believe that the use of alcohol is detrimental to the human economy, and whereas its use in therapeutics as a tonic or stimulant, or for food has no scientific value, therefore Be it resolved, That the American Medical Association is opposed to the use of alcohol as a beverage; and Be it further resolved, That the use of alcohol as a therapeutic agent should be further discouraged.
الصفحة 383 - Bronchi and lungs, posterior view, showing position of heart. 1, 1, summit of lungs; 2, 2, base of lungs; 3, trachea; 4, right bronchus; 5, branch to upper lobe of lung; 6, branch to lower lobe; 7, left bronchus; 8, branch to upper lobe; 9, branch to lower lobe; 10, left branch of pulmonary artery; 11, right branch; 12, left auricle of heart; 13, left superior pulmonary vein; 14, left inferior pulmonary vein...
الصفحة 388 - ... in the size of the thorax. If the hand is placed on the abdomen when a cough is made, the muscles of the abdominal wall will be felt to become hard and tense as they suddenly contract and press on the abdominal contents. A cough is a strong expiration which suddenly bursts upon the FIG.
الصفحة 358 - On the other hand, the human engine may easily become overstocked by an excess of fuel. The following list shows the main fuel foods, the great foundation foods of the diet, that supply energy for muscular work. Mental work requires so little extra fuel that it is not necessary to consider it specially. There are three groups of fuel foods. Here they are in the order of their cost per calory, those giving most energy for the money heading the list. 1. Starchy Foods. Cornmeal...

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