to hurt the digestion.

WILLIAM THOMSON.
Feb. 13, 1882.




PROFESSOR TRANTMANN,
BONN UNIVERSITY.


I am not a smoker, so that I am unable to make any statement
regarding the effect of tobacco. As to alcohol, I never make use of
spirits in order to stimulate my brain, but often, after working
hard, I drink a glass of beer or wine, and immediately feel relieved.

M. TRANTMANN.
March 14, 1882.




PROFESSOR TYNDALL, LL. D., F. R. S.


With regard to the use of alcohol and tobacco, I do not think any
general rule can be laid down. Some powerful thinkers are very
considerable smokers, while other powerful thinkers would have been
damaged, if not ruined, by the practice. A similar remark applies in