AND PHYSIOLOGY. 



355 



which shall we give the preference ? Shall we deprive our 

 bodies of exercise, or shall we give up the best efforts of the 

 brain? Without hesitancy, as a general rue, we should * 

 say, attend to the physical exercise first, for if the general 

 health be broken down, the brain will sympathize, and then 

 close mental effort will be at an end. Hence, although morn- 

 ing is the best time for study, yet we must not take the whole 

 of it for that purpose, but must share it with exercise. To a 

 student who is passing through a long course of study, early 

 rising and retiring, and generally exercise in the morning 

 before commencing study, will tend to preserve and invigorate 

 health. Studying late at night and sleeping long in the 

 morning, are injurious to no class of people more than to the 

 hard student. 



650. Pernicious Effect of Tobacco on the Brain— 9. 



The effect of tobacco on the brain is thus described, in his 

 medical lectures, by Dr. Solly, an eminent physiologist and 

 practical physician: "I would caution you, as students, 

 from excesses in the use of tobacco and smoking, and I would 

 advise you to disabuse your patients' minds of the idea that 

 it is harmless. I have had a large experience of brain dis- 

 ease, and am satisfied now that smoking is a most noxious 

 habit. I know of no cause or agent that tends so much to 

 bring on functional disease, and through this in the end to 

 lead to organic diseases of the brain, as excessive use of to- 

 bacco." 



651. Power of the Feelings over th« Nervous System, — 

 10. It is wonderful and interesting to see what is the power 

 exerted by the feelings and emotions upon the nervous sys- 

 tem, and through that upon the whole body. Let the farmer 

 feel that his severe labor is sure to bring him in good crops, 

 and how happily does he persevere in his severe toil month 

 after month. And if the merchant can only know that his 



But how shall exercise awl study both be properly attended to? What is said of early 

 rising? 650. How does tobacco affect the. bruin ? 651. What effect have the emotions 

 upon the physical system ? 



