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 hmited 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 tem., 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 telegonie. 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 I'epilepsie. Archiv de Physi- 

 ologic Normal et Pathol. 1869. 

 Remarques sur I'epilepsie causee par la section du nerf sciatique. 



Ibid. 1870. 

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

 Faites nouveaux ^tablissait I'extreme frequence de la transmission 

 par I'heredite d'etats organiques morbides produits accidentelle- 

 ment chez les descendents. Compt. Rend. 1882. 



Charrin, a., Delamare, G., et Moussu, G. Transmission experi- 

 raentale aux descendants des lesions developpees 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 EigcnschafTten. 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. 



