TITLES. 
Gen. Sub. 25 
427. Mathews, A. P. Artificial parthenogenesis produced by mechanical 
agitation. Arner. J. Physiol, vi, pp. 142-154. 
428. -. The so-called cross fertilisation of Asterias by Arbacia. T. c. 
pp. 216-218. 
429. Mauck, A. Y. On the swarming and variation in a Myriapod 
( Fontaria virginiensis). Amer. Natural, xxxv, pp. 477 & 478. 
430. Mayer, A. G. The variations of a newly arisen species of Medusa. 
Bull. Mus. Brooklyn i, pp. 1-27, 2 pis. 
431. Maziarski, St. Ueber den Bau und die Einteilung der Driisen. 
Anat. Hefte xviii, pp. 173-237, 4 pis. 
432. Mazza, F. Sulla prima differenziazione delle gonadi e sulla matu- 
razione delle uova nella Lebias calaritana. Monit. Zool. ital. xii, 
pp. 235-237. 
433 . Mead, A. D. The natural history of the star-fish. Bull. U. S. Fish 
Comm, for 1899 (published 1900), pp. 203-224, 4 pis. 
Cited re Growth, Sexual Maturity, Habits, and in particular regener¬ 
ation. 
434. Meissner, M. Geheimrath Prof. Dr Eduard von Martens. Eine 
biographische Skizze. Festschr. f. E. von Martens. Beiheft zum Arch. 
Naturg. lxvii, pji. i-viii. 
435. Meldola, R. Sexual dimorphism. [Letter.] Nature lxiii, pp. 252 
& 299. 
436. Mendel, J. G. Experiments in hybridisation (1865). Trans., with an 
introduction by W. Bateson. J. R. Horticultural Soc. xxvi, pp. 1-32. 
437. Mesnil, F. Sur un cas de regeneration de la partie anterieure du 
corps et de la trompe chez un Syllidien. C.R, Soc. Biol, liii, pp. 268- 
270. 
438. -. Yiviparite et parthenogenese chez les Annelides polych5tes. 
T. c., pp. 270 & 271. 
439. Metcalf, M. M; Phagocytosis in a mammalian ovary. Biol. Bull, 
ii, pp. 338 & 339. 
440. Metchnikoff, E. On the process of hair turning white. P. R. Soc. 
London lxix, p. 156. 
441. -. Les poisons cellulaires (Cytotoxines). Rev. gen. Sci. xii, pp. 
7-15. 
442. *■-. LTmmunite dans les maladies infectieuses. 8vo, Paris, 43 
coloured figg. 
443. *-. Etudes biologiques sur la viellesse. i. Sur le blanchiment 
des cheveuz et des poils. Ann. Inst. Pasteur xv, pp. 865-879, 2 pis. 
444. Meves, F. Ueber die sogenannten wurmformigen Samenfaden von 
Paludina und fiber ihre Entwickelung. Verh. Anat. Ges. 15 Vers, 
in Anat. Anz. xix, Erg. Hft., pp. 23-36, 8 figg. 
445. -& Korff, K. von. Zur Kenntniss der Zelltheilung bei Myrio- 
poden. Arch. mikr. Anat. lvii, pp. 481-486, 1 pi. & 5 figg. 
Meyer, G. [See Hacker & Meyer (273).] 
446. Meyer, J. A. Ueber Zerfallsvorgange an Ovarialeiern von Lacerta 
agilis. Anat. Hefte xviii, pp. 71-96, 4 pis. 
Miall, L. C. [See White (706).] 
