_Elements of Chemistry familiarly explained and practically
illustrated_.
This is an excellent little work by Mr. Brande: it is not avowedly so,
although everyone familiar with his valuable Manual of Chemistry will
soon identify the authorship. The present is only the first Part of this
petite system, containing Attraction, Heat, Light, and Electricity.
It is, as the author intended it to be, "less learned and elaborate
than the usual systematic works, and at the same time more detailed,
connected, and explicit than the 'Conversations' or 'Catechisms.'"
It avoids "all prolixity of language and the use of less intelligible
terms;" and, to speak plainly, the illustrative applications throughout
the work are familiar as household words. Witness the following extract
from the effects of Heat:
_Ventilation--Heating Rooms_.
"In consequence of the _lightness_ of heated air, it always rises
to the upper parts of rooms and buildings, when it either escapes, or,
becoming cooled and _heavier_, again descends. If, in cold weather,
we sit under a skylight in a warm room, a current of cold air is felt
descending upon the head, whilst warmer currents, rising from our bodies
and coming into contact with the cold glass, impart to it their excess
of heat.
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