Human Physiology. 



of a gramme. It accelerates the action of the heart, and at 

 the same time diminishes the force of the circulation by 

 paralysing the ganglionic nerves of the heart. The violent 

 muscular exertion of the now fashionable athletic contests have 

 a similar effect in producing nervous disorder and exhaustion. 

 Nothing can be better for either sex than a moderate amount 

 of daily exercise, and the fatigue from which one perfectly 

 recovers with a night's sleep is no harm to any one ; but the 

 training that takes the whole force of the body, and tne violent 

 efforts of struggles for victory, are not consistent with health, 

 with an even development of mind and body, or high intellec- 

 tual achievement. 



No one who does much work with his brain can safely 

 exhaust his powers with muscular exercise. Even long walks 

 are not favourable to mental application. The more passive 

 kinds of exercise, as riding on horseback, are best for brain 

 work. We think best in the morning after a night's rest and 

 sleep. Four or six hours of intellectual labour a-day are as 

 much as is consistent with the health of brain and body. 

 From six to eight hours a-day is time enough for any kind of 

 severe or monotonous toil; but where work is light, varied,, 

 and interesting, as all work ought to be; where we can turn 

 from one kind of employment to another, and find interest and 

 recreation in it, we may work pleasantly and healthfully most 

 of our waking hours. 



Dyspepsia and constipation are two diseases or disordered 

 conditions of the nutritive system, which are the causes of 

 numerous maladies. As nutrition builds up the body and 

 sustains it in all its parts and functions, every kind of disorder 

 may come from, or be coincident with, a disordered nutrition. 

 If the stomach will not perform its function death is inevitable. 

 If it performs it imperfectly life is feeble, painful, and will 

 probably be of short duration. With a diseased stomach, 

 disordered bowels, and imperfect excretion, what can there be 



