48 Mr. king’s Account of a 
much hardened, and preferved for a much longer time 
than has been ufiial, from the injuries of the weather, by 
being w allied and brulhed over by water, in which is in- 
fufed a folution of iron. And perhaps even the fofter 
lands of ifones might have been preferved by this means; 
and the venerable remains of that fine pile of building 
henry the vnth’s chapel, might have been faved from 
the deftru&ion with which we now fee it ready to be 
overwhelmed. 
It is very probable, moreover, that common fea fand, 
with a very fmall admixture of a folution of iron, may 
at length, without any great expence, be converted into 
a moll; ufeful fpecies of hone, and be applied to the pur- 
pofe of covering the fronts of houfes even more durably, 
and in as beautiful a manner as fome of the late invented 
ftuccos ; and even thole ftuccos may be improved by 
means of the fame mixture. 
It mult be left to future experiments to afcertain what 
proportions of the Iblutions of iron are bell to be made 
ufe of; and in what manner the folution may bell be ob- 
tained for this purpofe ; whether by a vitriolic acid ; or 
merely by laying rully iron for fome time in water (i> . 
But one caution Ihould be obferved; namely, that if too 
(i) It is not perhaps poffible to contrive a lefs faturated tinfture of iron than 
the rult di fioived in water. 
great 
