Influemx of Eoivironment upon the Organism. 481 



94. Leuckart, Pt. Die Parasiten des Menschen. Vol. i. trans- 



lated by W. E. Hoyle. Cf. Art. Parasitism (P. 

 Geddes), Encycl. Brit. 



Ectoparasites experience meclianical influence in motion of 

 host ; physical, in warmth of host ; transportation to 

 difierent medium ; and chemical influences from abun- 

 dant food and exlialations. 



Endoparasites experience mechanical influence from peristalsis, 

 confined space, relative absence of currents ; physical in 

 darkness, incubatory warmth, etc. ; chemical from mois- 

 ture, abundant rich nutrition, gases, gastric juice, etc. 

 Also the influence on hosts. ' 



95. Mace. L'heterogamie de I'Ascaris dactyluris. Comptes 



Rendiis, ciii. (1887), pp. 306-308. 



In Ascaris dactyluris young develop and mature within 

 mother at expense of her tissues, and are without excep- 

 tion females. (Anabolic conditions favouring female- 

 ness.) 



96. Maupas, E. Sur la multiplication de la Leuco2)hrys patula. 



Comptes Rendus, ciii., pp. 1270-1273. 



Relation between varying nutrition and modes of reproduc- 

 tion. 



97. '■ . Peponse a M. Balbiani a propos de la Leu^ 



co- 



;phrys patula. Comptes Pendus, civ. (1887), pp. 308- 

 310. 



In Leucophrys, with abundant food, fission ; with scanty 

 food, metamorphosis without encystation, followed by 

 six successive divisions which have for their end con- 

 jugation. 



98. ~ — — . Sur la puissance de multiplication des Infusoires 



cilies. Comptes Rendus, civ. (1887), pp. 1006-1008. 

 Reproductive power of Ciliata depends, (1.) on the quality 

 and quantity of the food ; (2. ) on the temperature ; (3. ) 

 on the alimentary adaptation of the buccal organs. 

 With a vegetarian diet, the rate of reproduction is much 

 less, and the size smaller. 



99. MoRiNi, F. Ancora sulla questione della sessualita nelle 



TJstilaginee. Mem. Accad. Sci. Bologna, vi., 2 (1885), 

 pp. 283-290. 



Deficient nutrition, a condition of conjugation of conidia of 

 Ustilaginefe, 



