306 ESSAYS anp OBSERVATIONS 
which allows the air to pafs in both 
cafes ? 
Is not the force, by which the infpira- 
tory organs, aCing with the greate(t ener- 
gy of the mind, exceed the power of the 
exfpiratory organs uninfluenced by the 
‘mind, confiderably lefs than the weight 
of the atmofphere ; fince, if, after exf{pira- 
tion, we prevent the entry of the air by 
the glortis, we cannot dilate the thorax as 
in infpiration, though there is ftill a good 
deal of rarefying air in the lungs? 
Do not the infpiratory organs, during — : 
infpiration, overcome the refiftance of the 
ex{piratory organs, and likewife that fhare 
of the preffure of the atmofphere which 
the air, rufhing into thelungs, does not ba- 
lance? 
ARF not the ribs arched, and the {paces 
& 
¢ 
} 
% 
“ 
> 
between them narr ow, to prevent ill effects — 
from that unbalanced part of the atmo- 
(phere during infpiration? 
ART. = 
