
The SciencesMay 7, 1881
Hiddenite, an Emerald-Green Variety of Spodumene

Hiddenite, an Emerald-Green Variety of Spodumene

Crystals Extracted from Cast-Iron by Means of Ether or Petroleum

The Gas Wells of Pennsylvania

The Manufacture of Sulphuric Acid

The Manufacture of Sulphuric Acid