Rotterdam, W.L. & J. Brusse, 1907. 50, [ii, publisher's advertisement] pp. 8vo (16,5 x 25 cm.). Original printed wrappers, uncut. With publisher's device on title.
Printed in 425 copies only. A somewhat expanded version of a lecture addressed to the 3rd assembly of the Natuur- en Geneeskundig Congres (Leiden, April 1907). Rare. A fine copy.