Combined with the regular apparatus for resuscitation is an ordinary apparatus for the inhalation of oxygen; by the simple altering of a lever, either the one or the other can be employed.
II. INDUSTRIAL POISONING IN PARTICULAR INDUSTRIES
After the foregoing general remarks we may now consider various points of view in regard to classification of industrial poisonings into groups:
(1) Toxicological, based on the action of the poisons.
(2) Chemical, based on the chemical composition of the poisons.
(3) Physical, based on the varying density of the poisons. (Division into solid (in form of dust), gaseous, and liquid poisons.)
To which may be added:
(4) Classification according to the source of the poisoning and therefore according to industry, upon which Part I is mainly based.
In this section (Part II) a system is adopted which takes into consideration as far as possible all the principles of division mentioned above, in order to classify industrial poisonous substances in such a manner that general practical conclusions can be clearly drawn, and supervision rendered easy.