Dr. Fother gill on Longevity. 369 
utendi ex veneno facie Medicamentum, ex Medi- 
camento, venenum.” 
3. and 4. Motion and reft, fleep and watching. 
It is allowed on all hands, that alternate motion 
and reft, and deep and watching, are neceftary 
conditions to health and longevity; and that 
they ought to be adapted to age, temperament, 
conftitution, temperature of the climate, &c. 
but the errors which mankind daily commit, 
in thefe refpedts, become a fruitful fource of 
difeafes. While fome are bloated and relaxed 
with eafe and indolence, others are emaciated, 
and become rigid, through hard labour, watch¬ 
ing, and fatigue. 
5. Secretions and execretions. Where the 
animal functions are duly performed, the fecre- 
tions go on regularly 3 and the different evacua¬ 
tions fo exa&ly correfpond to the quantity of 
aliment taken in, in a given time, that the body 
is found to return daily to nearly the fame weight. 
If any particular evacuation happen to be pre- 
ternaturally diminifhed, fome other evacuation is 
proportionally augmented, and the equilibrium 
is commonly preferved 5 but continued irregula¬ 
rities, in thefe important functions, cannot but 
terminate in difeafe. 
6. Affe&ions of the mind. The due regula¬ 
tion of the paftions, perhaps, contributes more 
to health and longevity, than that of any 
Vol. I. B b other 
