TITLES. 
Gen. Sub. 47 
834. Wickenburg, Ed. Graf. Wanderungen in Ost-Afrika. 8vo, Wien, 
xx+ 440 pp., 41 pis., 3 maps, many figg. 
835. *Wiedersheim, R. Senescenza filogenetica. Riv. Sci. biol. i, 1899, 
Fasc. iv, pp. 1-7. 
836. Willey, A. General account of a zoological expedition to the south 
seas during the years 1894-1897. P. Zool. Soc. London 1899, pp. 7-9. 
837. Wilson, C. B. The habits and early development of Cerebratulus 
lacteus (Verrill), a contribution to physiological morphology. Quart. 
J. Micr. Sci. xliii, pp. 97-198, 3 pis. 
838. Wilson, E. B. The structure of protoplasm. Biol. Lect. Wood’s 
Holl 1898, pp. 1-20, 4 figg. 
839. -. Cell-lineage and ancestral reminiscence. T. c. pp. 21-44, 
5 figg. 
840. -. On protoplasmic structure in the eggs of Echinoderms and 
some other animals. J. Morphol. xv (Supplement), pp. 1-28, 2 pis. 
841. -. The structure of protoplasm. Science x, pp. 33-45, 4 figg. 
842. Wilson, J. T. Presidential address. [“Vitalism” versus “Mechan¬ 
ism.”] P. Linn. Soc. N. S. Wales xxiv, pp. 1-29. 
843. Windle, B. C. A. Ninth report on recent teratological literature. 
J. Anat. Physiol, norm. path, xxxi, pp. 507-526. 
844. -. Wissenschaftliche Meeresuntersuchungen herausgegeben von 
der Konnnission zur wissenschaftlichen Untersuchung der deutschen 
Meere in'Kiel und der biologischen Anstalt auf Helgoland. Neue 
Folge, Bd. hi (Abth. Helgoland), Heft i, 125 pp., 8 pis., 46 figg., 
Bd. iv (Abth. Kiel), 253 pp., 1 pi., 226 figg. 
845. Wolff, Julius. Die Lehre von der funktionellen Knochengestalt. 
Arch, pathol. civ, pp. 256-315, 1 pi. Biol. Centrbl. xix, pp. 738-744. 
846. Woodward, H. Sir William Henry Flower. Geol. Mag. vi, pp. 381- 
384. 
Woodward, M. F. [See Korschelt & Heider (411).] 
846a. Wortman, J. L. Otlniiel Charles Marsh. Science ix, pp. 561- 
565 (with portrait). 
847. Wyld, H. C. Biological analogy and speech-development. Nat. 
Sci. xiv, pp. 46-49. 
848. Wynn, W. H. Altruism and organic evolution. P. Birmingh. Soc. 
xi, pp. 6-43. 
849. Yung, E. Des variations quantitatives du plankton dans le lac 
Leman. Arch. Sci. Nat. viii, pp. 344-364, 1 pi. 
850. -. Des variations quantitatives du plankton dans le lac Leman. 
C.R. Ac. Sci. cxxviii, pp. 1128-1130. 
851. Zacharias, O. Das Plankton des Arendsees. Biol. Centrbl. xix, 
pp. 95-102. 
852. -. Ueber einige biologische Unterscliiede zwischen Teiclien und 
Seen. T. c. pp. 313-319. 
853. -. Ueber die Ursache der Verschiedenlieit des Winterplanktons 
in grossen und kleinen Seen. Zool. Anz. xxii, pp. 19-22, 25-31. 
