The cost of each depot has been L4,500, exclusive of land, of which
about an acre is required for the destructor, carbonizer, inclined road,
weigh office, and space. A supply of water is necessary, a good deal
being required for cooling the clinkers. The population of the two
districts belonging to these works is about 160,000.

The author has no longer any connection with the works described, and
for the recent experience of their working he is indebted to Mr.
John Newhouse, the superintendent of the sanitary department of the
corporation.

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GREEN WOOD.


The specific volume of the different constituents of green woods has
been estimated by M. Hartig to be as follows, per 1,000 parts: Hard
green wood, fiber stuff, 441; water, 247; air, 312. Soft green wood,
fiber stuff, 279; water, 317, air, 404. Evergreen wood, fiber stuff,
270; water, 335; air, 395. A certain amount of water--7 or 8 per cent in
all--is included with the fiber stuff, showing that about one-third only
of the mass of the wood is solid stuff; the remainder is either water or
air space.

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