Chapter II: CHEMISTRY.--An Apparatus for Heating Substances in Glass

Tubes under Pressure.--By H. PEMBERTON, Jr.--A simple apparatus
for effecting this purpose, avoiding risk of personal injury.--
2 illustrations

Table of Atomic Weights.--A revised table of atomic weights,
giving the results of the last determinations, and designed for
every-day use

Testing Cement.--A laboratory process for testing Portland cement