[ 354 I 
XXIII. On the Degree of Salubrity of the common Air at 
Sea , compared with that of the Sea-fhore , and that of 
Places far removed from the Sea. In a Letter from John 
Ingen Houfz, M. D. F. R. S. to Sir John Pringle, 
Bart. F. R. S. Dated Paris, Jan. 22, 1780. 
S you had recommended to me the examination of 
the air at fea by the nitrous teft, I followed your 
advice in my return to the Continent in the beginning 
of November laft : and I embraced that opportunity with 
the more eagernefs, as I knew that you had given credit 
to the account of feveral confumptive people having re- 
covered their health by going on fea voyages, after the 
common means for curing that diftemper had failed. 
I was in hopes likewife to find in this inquiry, a con- 
firmation of what you conjectured in your Anniverfary 
Difcourfe in the year 1773, viz. that great bodies of 
water, fuch as feas and lakes, are conducive to the health 
of animals, by purifying and cleanfing the air contami- 
Head April 24, 1780, 
S I R, 
nated 
