Biology for BeginnersH. Holt, 1921 - 558 من الصفحات |
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عبارات ومصطلحات مألوفة
absorbed absorption adapted alcohol arteries Atkinson attached bacteria bark Biology birds blood body bone Botany brain breathing called capillaries carbon dioxide carnivora cause cavity cells CHAPTER chlorophyll Civic Biology COLLATERAL READING color compounds corn cotyledons Coulter crayfish crustacea developed digestive disease ducts eggs Elementary Zoology embryo endosperm energy epidermis Excretion fats feathers fertilized fibers fish flower food-getting forms frog fruit function germs gills glands grains grow growth hairs harmful heat hypocotyl important insects intestine labium larva layer leaf leaves legs locomotion lungs lymph maxillae Maxillipeds membrane milk mouth muscles nerve nervous system nitrogen organs osmosis ovary oxidation oxygen pair photosynthesis Physiology plants and animals poisonous pollen produce protection proteid protoplasm protozoa reproduction respiration roots seed skin snakes soil starch stem stomach structure substance sugar supply surface teeth tion tissue trachea trees tube usually veins Vocabulary walls waste wings wood worms Zoology
مقاطع مشهورة
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 - Down among his nerve-cells and fibers the molecules are counting it, registering it, 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...
الصفحة 413 - As we become permanent drunkards by so many separate drinks, so we become saints in the moral, and authorities and experts in the practical and scientific spheres, by so many separate acts and hours of work.
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 434 - ... nonabstainers. The number of weeks of sickness in the table refers to the average number of weeks for which the members call upon the sick fund of the society. The following are rules of individual hygiene as summarized from the Yale Lectures on Hygiene by Professor Irving Fisher, 1906-1907: — Air Keep outdoors as much as possible. Breathe through the nose, not through the mouth. When indoors, have the air as fresh as possible — (a) By having aired the room before occupancy. (6) By having...
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 434 - water is better than " hard " water. Ice water should be avoided unless sipped and warmed in the mouth. Ice may contain spores of germs even when germs themselves are killed by cold. Cool water drinking, including especially a glass half an hour before breakfast and on retiring, is a remedy for constipation. Food Teeth should be brushed thoroughly several times a day, and floss silk used between the teeth. Persistence in keeping the mouth clean is not only good for the teeth, but for the stomach....