heat, and so condense the water.

And now--to go into the history of this wonderful production of water from
combustibles, and by combustion--I must first of all tell you that this
water may exist in different conditions; and although you may now be
acquainted with all its forms, they still require us to give a little
attention to them for the present, so that we may perceive how the water,
whilst it goes through its Protean changes, is entirely and absolutely the
same thing, whether it is produced from a candle, by combustion, or from
the rivers or ocean.

First of all, water, when at the coldest, is ice. Now, we philosophers---I
hope that I may class you and myself together in this case--speak of water
as water, whether it be in its solid, or liquid, or gaseous state,--we
speak of it chemically as water. Water is a thing compounded of two
substances, one of which we have derived from the candle, and the other we
shall find elsewhere. Water may occur as ice; and you have had most
excellent opportunities lately of seeing this. Ice changes back into
water--for we had on our last Sabbath a strong instance of this change, by
the sad catastrophe which occurred in our own house, as well as in the
houses of many of our friends,--ice changes back into water when the
temperature is raised: water also changes into steam when it is warmed
enough. The water which we have here before us is in its densest
state[11], and although it changes in weight, in condition, in form, and
in many other qualities, it still is water; and whether we alter it into
ice by cooling, or whether we change it into steam by heat, it increases
in volume,--in the one case very strangely and powerfully, and in the
other case very largely and wonderfully. For instance, I will now take
this tin cylinder, and pour a little water into it; and seeing how much
water I pour in, you may easily estimate for yourselves how high it will