64 Experimental Zoology 



hypothesis. The elementary characters of the cell are assumed 

 to be contained in minute, living elements, gemmules, pan- 

 genes, etc., that multiply and increase independently of each 

 other; but their migrations are now limited to the individual 

 cell. The nucleus is believed to be the storehouse of these 

 units that issue forth at times to perform any function whatever 

 that may be assigned, pro tern., to the cell. De Vries's theory of 

 intracellular pangenesis rests on this assumption. How such 

 bodies eat up or replace the rest of the cell contents to dominate 

 its function we are not told, and details of a chemical nature are 

 deplorably lacking. Since this army of .immigrants is confined 

 within the boundaries of the cell, they have no importance to us 

 in this connection. The historical origin of the ideas in regard 

 to these bodies is, however, not without interest here. The 

 superficial analogy between the theory and that of the atomic 

 theory of the chemists has sufficed to lure many writers into 

 this fascinating and facile mode of speculation. 



LITERATURE, CHAPTER V 



BARTHELET. Experiences sur la te'le'gonie. Compt. Rend. Paris. Tom 



131. 1900. 

 BELL, A. L. The Influence of a Previous Sire. Journ. Anat. and Physiol. 



XXX. 1896. 

 BROWN-SEQUARD. Nouvelles Recherches sur 1'epilepsie. Archiv de Pbysi- 



ologie Normal et Pathol. 1869. 

 Remarques sur 1'epilepsie caused par la section du nerf sciatique. 



Ibid. 1870. 



Quelques faits nouvelles relatifs a 1'epilepsie. Ibid. 1871. 

 Faites nouveaux dtablissait Pextreme frequence de la transmission 



par 1'heredite d'e"tats organiques morbides produits accidentelle- 



ment chez les descendents. Compt. Rend. 1882. 

 CHARRIN, A., DELAMARE, G., et Moussu, G. Transmission experi- 



mentale aux descendants des lesions developpe'es chez les ascendents. 



Compt. Rend. Acad. Sc. Paris. CXXXV. 1902. 



DAVIS, B. M. Studies on the Plant Cell. Am. Natural. XXXIX. 1905. 

 EWART, J. C. The Penycuik Experiments. London. 1899. 

 FISCHER, E. Experimentelle Untersuchungen ueber die Vererbung er- 



worbener Eigenschafften. Allgem. z. f. Entomologie, VI. 1901. 

 GALLOWAY, T. W. The Experimental Evidence for the Inheritance of 



Acquired Character in Organisms. Cumberland Presbyt. Quar- 

 terly, I. 1902. 

 HERING, E. Ueber das Gedachnis als eine allgemeine Function der 



organischen Materie. 1870. 



