On Salt Rain, &c. 825 
weather: upon my answering in the negative, 
they immediately pointed out the phenomenon 
on the window of my roém. Mr. Black- 
wall produced a moist sponge, with which he 
had rubbed a window thus circumstanced, 
and requested me to examine chemically 
whether the water contained any common 
salt. On washing the sponge in distilled 
water, I found, by the usual test, namely, 
nitrate of silver, that the water exhibited 
decisive marks of the presence of muriatic 
acid. My own window, treated in the same 
manner, also gave clear traces of muriatic 
acid. Since which I have tried other win- 
dows exposed to the storm, all of which 
yielded less or more of muriatic acid. 
Suspecting that the sponge might naturally 
contain a portion of salt, I washed it well in 
pure water, and then applied the test to wa- 
ter expressed from it, when scareely any 
trace of the acid was to be found; and the 
little that appeared was eyidently the residue 
of what had previously been imparted by the 
forementioned applications of the sponge to 
the windows. 
These observations on the effects of the 
storm upon the windows-on the late occasion, 
have not been copfined to two or three indi- 
viduals, but have been very general. Seve- 
