Library of Formatting Examples:Boldface/09A

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§ 142. <b>Paraffin Oil (or kerosine, mineral oil, photogen, &c.)</b> is the chief product
resulting from the distillation of American petroleum--the usual specific gravity is
about ·802--it is a mixture of hydrocarbons of the paraffin series. It should be free
from the more volatile constituents, and hence should not take fire when a flame is
applied near the surface of the cold liquid.

§ 143. <b>Effects of Petroleum.</b>--Since we have here to deal with a commercial substance
of such different degrees of purity, and various samples of which are composed
of such various proportions of different hydrocarbons, its action can only be stated
in very general terms. Eulenberg has experimented with the lighter products
obtained from the distillation of Canadian petroleum. This contained sulphur products,
and was extremely poisonous, the vapour killing a rabbit in a short time, with

Parentheses in headings

The parentheses are part of the first in-line sub-heading, and go inside the tags. THIS IS UNUSUAL.

Complete sentences

The second in-line sub-heading is a complete sentence: period goes inside.