Hcefnaftatks. 8g 
ty Artery into the Cavity of the Veficles and 
Bronchi^y tis no wonder th at fo great Difeharges 
of Humours arc often made thro’ the fame Paf- 
fages, when the Blood is much diluted, by be- 
ing in Colds furcharged with too much obftrud-J 
cd perfpirable Matter, or otherwife difordered : 
Hence alfo fome Afthma s have their Origin. 
17. Sir John Floyer in his Treatife of the 
Afthma affigns the immediate Caufe of k 
to be the Straitnefs, Compreflion, or Con- 
ftridion of the Bronchia. He obferves that 
the Fit of the Afthma happens fuddenly, 
thro' the EfFervefcence of the Blood, occa- 
fioned by external Caufes which feparate the 
Lympha la£tea from the Blood, which flops 
in the fwelled Glands of the Lungs/* This 
Notion of his feems to be confirmed by what 
is found to be conftantly the Cafe, when Wa- 
ter inftead of Blood flows into the Arteries of 
a Dog, in which cafe, as is obferved in 
periment XIV. Numb. y. all the Mufcles of 
the Dogs were convulfed : And the like De- 
fluxion of thin ferous Humours on the Nerves 
and mufcular Fibres of the Bronchia and Ve- 
ficles may probably by contrading them in 
the fame manner occafion the abovemention- 
ed Scraiejnefs and Conftridion of the Bron^ 
chiit 
