SA Supplements

The Orang-Mammas.—An Unknown Sumatran Tribe

Babylonian Seals

Animal Scavengers

The Giant Tortoise of the Berlin Zoo

Cyrtanthus Obliquus

Fillets and Round Corners on Castings

Pollution of Streams, with Special Reference to the Chicago Drainage Channel

Stone Carving Machinery

The Bollée Voiturette

Trade Suggestions from United States Consuls

A Study of Anger

Trade Notes and Receipts

Selected Formulæ

Fog Signal Detonator Economizer

New Boring Machine

A New Stopcock for Compressed Air Reservoirs

Government Telegraphy

The De Bange and Piffard Rapid-Fire Gun

The Labor of Discovering a New Element

The use and Abuse of Food Preservatives

Patents!

Why is Water Blue?

New Books, Etc.