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able active already amount appear arterial attack attention become blood brain brain exhaustion cause cell centers cerebral exhaustion certain changes condition considerable considered constitute contained contrary demands derangement difference direction disease disorders dreams effects emotions employed energy entirely excessive exciting exercise exhibit exist experience extreme fact faculties force frequently functional give given habit hand head healthy ideas important impressions increased individual influence insanity instances intellectual interesting irritability kind less manifestations marked matter means Medical memory ment mental methods mind morbid muscles muscular nature necessary nervous nutrition observation organ pain particularly patient period persons phenomena physical physiological position possible practical present principles produced question reading reason regard respecting rest result sleep society Sometimes sources specific sufficient symptoms things tion tissue tobacco treatment trouble true usually various vital whole worry York
Halaman 192 - ... develops the capacity for work ; but food is not directly converted into force in the living body, nor is it a source of muscular power, except that it maintains the muscular system in a proper condition for work.
Halaman 170 - Alcohol and tobacco are of no value to a healthy student." 2. "That the most vigorous thinkers and hardest workers abstain from both stimulants." 3. " That those who have tried both moderation and total abstinence, find the latter the more healthful practice." 4. "That almost every brain-worker would be the better for abstinence." 5. " That the most abstruse calculations may be made, and the most laborious mental work performed, without artificial stimulants.
Halaman 190 - ... which the currents flow more largely around than through the muscles. The lessened blood-supply is a result of diminished functional movement, and we need to create a constant demand in the inactive parts. But, besides this, every active muscle is practically a 1 Seguin Lecture, op. fit. throbbing heart, squeezing its vessels empty while in motion, and relaxing, so as to allow them to fill up anew.