Abstract
THERE are certain knotty points which teachers of elementary chemistry know to be difficult for students to understand, and which are not sufficiently considered in small text-books. Such are the nascent state, absolute existence of masses and molecules, smoke rings and vortex atoms, modes of chemical action, affinity, substitution,&c. This book aims at filling the gap in the literature of chemical teaching, and though on some points it is not any fuller than several elementary text-books we could name, it contains a number of clear and concise descriptions of topics which present difficulties to the student.
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