Manchester and London: Manchester University Press/Longmans, Green and Co., 1920.
First Edition. Hardcover. Very Good-. Publications of the University of Manchester No. CXXXIX. 114 pp + 51 plates, most from photographs taken under the microscope by J.W.C. Goethart, Director of the Herbarium at Leiden University. Original green cloth, no dust jacket. Spine darkened, corners a bit rubbed. Binding sound, contents clean. Jansen (1867-1935) was a leading Dutch orthopedic surgeon and researcher.