(52) Cayzer v. Taylor, 10 Gray, 280,



35

able diligence, and reasonable diligence implies, as between the
employer and employe, such watchfulness, caution and foresight as,
under all the circumstances of the particular service, a corporation
controlled by careful, prudent oflQcers ought to exercise." (53

4. In manufacturing, transporting, or keeping an exceptionally
dangerous thing, powder or dynamite, for example, more care must
be exercised than in refining, transporting or keeping sugar. This
subject has been well considered by Justice Field of the Supreme
Court of the United States in the case of an employe in an iron mine
who was injured by an explosion of dynamite. "All occupations
producing articles or works of necessity, utility or convenience may
undoubtedly be carried on, and competent persons familiar with
the business and having suflQcient skill therein may properly be em-
ployed upon them, but in such cases where the occupation is at-
tended with danger to life, body or limb, it is incumbent upon the
promoters thereof and the employers of others thereon to take all
reasonable and needed precaution to secure safety to the persons
engagd in their prosecution, and for any negligence in this respect,
from which injury follows to the person engaged, the promoters or
the employers may be held responsible and mulcted to the extent
of the injury inflicted." In the controversy before the court it was
shown that the explosive nature of the materials from heat or col-
lision was well known to the employers, and this was a continuing
admonition to them to take every precaution to guard against such
a consequence. "Occupations, however important," continued the
court, "which cannot be conducted without necessary danger to life,
body or limb should not be prosecuted at all without reasonable
precautions against such dangers afforded by science. The neces-
sary danger attending them should operate as a prohibition to their
pursuit without such safeguards. Indeed, we think it may be laid
down as a legal principle, that, in all occupations which are at-
tended with great and unusual danger, there must be used all ap-
pliances readily attainable known to science for the prevention of
accidents, and that the neglect to provide such readily attainable
appliances will be regarded as proof of culpable negligence. 