MANY years ago, when skating was but in its infancy, skates were made of bone, and if they could be made to stay on the feet they were considered to answer their purpose sufficiently well.

FOR some years past a marked increase of attention on the part of English chemists towards the rapidly developing physical chemistry has been observable. Until recently, however, the available English ...

Scientific American is part of Springer Nature, which owns or has commercial relations with thousands of scientific publications (many of them can be found at www ...