(Northern Minnesota and Wisconsin.) The
occupations and sights along the Upper Mississippi and its head-waters,
the pineries, and even the spring floods, are intimately connected,
causally, with the saw-mills and lumber yards lower down. Or going in
the opposite direction from the saw-mill, we follow the lumber till it
is used in the various forms of construction. Some of it enters the
planing-mills and is converted into moldings, finishing lumber, sashes,
blinds, etc. In all forms it is loaded upon the cars, and shipped
westward to be used in the construction of houses and bridges.
Before we get through with the line of thought engendered by observing
the saw-mill, we have canvassed the whole lumber industry from the
pineries to the plans of architects and builders in the actual work of
construction. Not only has there been this progress of the mind from
one object or machine to another of a _series_ connected by cause and
effect, but there has been also a constant tendency to pass from the
individual machines of which the series is composed to the classes of
which these objects are typical. A circular-saw or a gang-saw is each
typical of a class of saws.
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