Science Books

The Chemical Constituents of Piper Methysticum

Alice A. Ball

The fresh rhizome was chopped up and then ground up by means of a meat chopper. In the preliminary work the material was dried in a vacuum oven at a temperature not exceeding forty degrees Centigrade...

The Lone Swallows

Henry Williamson

The rooks are now busy in the elms of the churchyard, and drifting thwartwise the wind with sticks for their nests. Sometimes a young male bird comes with food for his mate as she pleaches the twigs w..