tjo- Observations on

my expectations from it. My own obser-*vations have not, indeed, been many; butaccording to them the difference of theopen air in different places, as indicated bya mixture of nitrous air, is generally incon-siderable ; and I have reason to think thatwhen very unwholesome air is conveyed to itgreat distance, and much time elapses be-fore it is tried, it approaches, by somenpeans or other, to the state of wholesomeair. At least such I have found to be theworst air that has at any time been sent tome in Wiltshire from distant manufacturingtowns and workshops &c. in them, wherethe air was thought to be peculiarly un-wholesome. I am satisfied, however, frommy own observations, that air may be veryoffensive to the nostrils, probably hurtful tothe lungs, and perhaps also in consequenceof the presence of phlogistic matter in it,without the phlogiston being so far incor-porated with it, as to be discoverable by themixture of nitrous air.

I gave several of my friends the troubleto fend me air from distant places, especially,

from.