a nonserum protein

Jagdgeschwader 1 (JG 1), the Red Baron's Flying Circus

Now I can imagine a quaternionist (unless prejudiced) admitting the simplicity of establishment and of operation, and the convenience of the notation, and its sufficiency for practical requirements up to a certain point; and yet adding the inquiry whether there is not, over and above this vector analysis, a theory of Quaternions which is overlooked.

We had never seen anything like it and we had presence of mind to save several twigfuls of leaves, which proved to be the right food.