ULTIMATE CONVENTIONALISM, in which all parts are
represented; (g) By reduction to Outline of several
pigments; (h) Reduction to Outline of one pigment (see §18).


Inasmuch as Realism ceases so soon as any reduction in the three
qualities (of color, gradation, and shadow) is introduced; and the
treatment becomes more Conventional in each method after the
first--these are classified under the heading of CONVENTIONALISM.

[There is an analogous scale of reduction in Form, from the
Complete-relief of an isolated Statue to the Flatness of a
Floor-plate; but this does not belong to the present subject.]


* * * * *




THE CYCLOSTAT.


The various processes commonly employed for the observation of bodies
in motion (intermittent light or vision) greatly fatigue the observer,
and, as a general thing, give only images, that are difficult to
examine. We are going to show how Prof. Marc Thury, upon making
researches in a new direction, has succeeded in constructing an
apparatus that permits of the continuous observation of a body having
a rapid rotary motion. The principle of the method is of extreme