328 On Salt Rain 
extracted ; now the water of the 5th instant 
was five times as long in the bottle as the 
latter quantity, and may therefore be supposed 
to have got four or five times as much salt; 
but it had eight times as much; so that still 
an excess of salt appears on the 5th, which 
cannot be accounted for without supposing it 
to be introdticed by the rain. 
Tn order to be fully satisfied on the subject 1 
undertook another analysis. I collected aquan- 
tity of water from alead cistern, for rain water, 
the surface of which was inaccessible to any 
one, and consequently the water could not 
have been modified, either by accident or de- 
sign. This was done on the 6th instant just 
after the fall of rain. Fortunately I had 
also access to a quantity of water drawn pre- 
viously to the storm, from the same cistern, 
into a wooden tub, as a reserve for domestic 
purposes. 
These two kinds of water were examined, 
the’ cistern water of the 5th December cor- 
responded with the rain-gage water of the 
same day; and the tub water corresponded 
with the gage water that fell a few days after 
the storm, as far as regards the quantity 
of muriatic acid which they respectively 
contained. 
