64 Experimental Z oilogy 
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 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. Expériences sur la télégonie. Compt. Rend. Paris. Tom 
131. 1900. 
Bet, A. L. The Influence of a Previous Sire. Journ. Anat. and Physiol. 
XXX. 1896. 
BRowNn-S£QuARD. Nouvelles Recherches surl’epilepsie. Archiv de Physi- 
ologie Normal et Pathol. 1869. 
Remarques sur l’epilepsie causée par la section du nerf sciatique. 
Ibid. 1870. 
Quelques faits nouvelles relatifs 4 ’epilepsie. Ibid. 1871. 
Faites nouveaux établissait Vextréme fréquence de la transmission 
par Vheredite d’états organiques morbides produits accidentelle- 
ment chez les descendents. Compt. Rend. 1882. 
Cuarrin, A., DELAMARE, G., et Moussu, G. Transmission experi- 
mentale aux descendants des Iésions developpées 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. Experimeritelle Untersuchungen ueber die Vererbung er- 
worbener Eigenschafften. Allgem. z. f. Entomologie, VI. gor. 
Gatioway, T. W. The Experimental Evidence for the Inheritance of 
Acquired Character in Organisms. Cumberland Presbyt. Quar- 
terly, I. 1go02. 
Herinc, E. Ueber das Gedichnis als eine allgemeine Function der 
organischen Materie. 1870. . 
