TITLES. 
Gen. Sub. 39 
746. Waite, F. C. Variations in the brachial and lumbro-sacral plexi of 
Necturus maculosus Raf. Bull. Mus. Harvard, xxxi, pp. 71-92, 2 pis. 
747. Wallace, A. R. The problem of instinct. Nat. Sci. x, pp. 161-168. 
748. Walther, J. Ueber die Lebensweise fossiler Meeresthiere. Zcitschr. 
gcol. Ges. xlix, pp. 209-273. 
749. Ward, H. B. Development of methods in microscopical technique. 
Tr. Amer. Micr. Soc. 1897, pp. 175-178. 
750. Ward, R. H. Ovum in testis of a Lamprey. Amer. Micr. J. xviii, 
pp. 213-217. 
751. Wasmann, E. Zur Entwicklung der Instincte. Verh. Ges. Wien, 
xlvii, pp. 168-183. 
752. . Instinct und Intelligent im Thierreich. Ein kritischer Beitrag 
zur modernen Thierpsychologie. 8vo, Freiburg i. B. viii & 94 pp. (1896). 
Cf. anonymous article: — Instinct in the animal and vegetable kingdom. 
Quart. Rev. No. 381, pp. 173-187. 
753. . Vcrgleichende Studien iiber das Seelenlcben der Ameisen und 
der hohern Thiere. 8vo, Freiburg i. B. viii & 122 pp. 
754. Watanabe, H. The phosphorescence of Gypridina hilgendorfii , 
Muller. Annot. Zool. Japon. i, pp. 69 & 70. 
755. Wattenwyl, Carl Brunner von. Betrachtungen liber die Farben- 
pracht dor Insckten. Leipzig, Folio, 16 pp., 9 col. pis. 
Translation by E. J. Bles, under the Title “Observations on the 
Coloration of Insects,” 16 pp. text. 
756. Webb, W. M. Prichard and acquired characters. [Letter] Nature, 
lv, p. 342. 
757. Weber, M. Beitrage zur Kenntniss dcr Fauna von Siid-Africa. 
Ergebnisse einer Reise von Prof. Max Weber im Jahre 1894. i. Zur 
Kenntniss der Siisswasser-Fauna von Sud-Afrika. Zool. Jahrb. Syst. 
x, pp. 135-200, 1 pi. 
758. Webster, J. C. The biological basis of menstruation. Reprint 
from the Montreal Medical Journal, April, 1897, 19 pp. 
General theory of sex. 
Welby, F. A. [See PIering, E. (341).] 
759. Welch, W. H. Biology and medicine. Amer. Natural, xxxi, 
pp. 755-766. 
760. . Adaptation in pathological processes. Scionco, v, pp. 813-832. 
761. Weldon, W. F. R. Karl Pearson on evolution. Nat. Sci. xi, 
pp. 50-54. 
762. Welsh, D. A. Concerning the parathyroid glands: a critical, ana- 
tomical, and experimental study. P. Scot. Micr. Soc. ii (1896 & 1897), 
pp. 128-143. 
763. Werner, F. Ueber die Schuppenbekleidung des regenerirten 
Schwanzes bei Eidcchsen. SB. Ak. Wien, cv (1896), pp. 123-146, 
2 pis. 
764. Werner, J. Polydactylie beim Schweine. SB. Ges. naturf. Berlin, 
1897, pp. 47 & 48. 
Westermark, F. [See Johansson & Westermark (377).] 
765. Wheeler, W. M. The maturation, fecundation, and early cleavage 
of Myzostoma glabrum , Leuckart. Arch. Biol xv, pp. 1-77, 3 pis. 
