Injiaoice of Environment upon the Orf/anism. 483 



108. Yung, E. De I'iiifluence des milieux physico-chimiques sur 



les etres vivants. Influence des difFerentes especes 



d'alinients sur le developpement de la grenouille 



{Rana esculenta). Arch. Sci. Phys. Nat, vii. (1882), 

 pp. 225-261. 



109. Cf. Pfluger, E. tJber die Geschlechtsbestimraenden Ur- 



saclien und die Geschlechtsverhaltnisse der Frosche. 

 Arch. f. ges. Physiol., xxix. (1882), p. 13. 



110. Zacharias, O. Ergebnisse einer zoologischen Excursus. 



Zeitschr. f. wiss. Zool., xliii., pp. 271-275, 4 figs. 



In spoutaneous transverse fission of Planaria, wben supply of 

 food abundant (anabolic condition), a new act of fission 

 was to be observed before daughter bud attained tlie 

 proportions of parent, but if amount of food reduced or 

 altogether withdrawn (katabolic condition), reproduc- 

 tion by fission completely ceased. 



111. ZoPF, W. Zur Morphologie und Biologic der niederen 



Pilzthiere (Monadinen), 45 pp., 5 pis. Leipzig, 1885. 



With much food ciliated forms {Pseudosjjora) become amoe- 

 boid (more anabolic) ; with more abundant food amoeboid 

 forms {Diplophy sails) become encysted (more anabolic) ; 

 with deficient food developmental history {Gymnococcus) 

 is simplified. 



III. Physical. 

 {a.) Heat (112-139). 



112. Barfurth, D. Versuche iiber die Verwandlung der Frosch- 



larven. Arch. Mikr. Anat., xxix. (1887), pp. 1-34, 

 Ipl. 



Reduction of heat retards tadpole metamorphosis, 



113. . Der Hunger als forderndes Princip in der 



Natur. Arch. Mikr. Anat., xxvii. (1886), pp. 121- 

 178. 



Relation of unfavourable temperature, etc., to sterility. 



114. Barthelemy, a. De Taction de la chaleur sur les pheno- 



ra^nes de vegetation. Comptes Rendus, xcviii. (1884), 

 pp. 1006, 1007. 

 Action of heat on roots and heliotropisim. 



