BODY SIZE AND CELL SIZE 187 



fessor Whitman's ('93) statement that, "The organism dominates 

 cell formation, using for the same purpose one, several or many 

 cells," is true within certain limits. But the differences in cell 

 number which are unimportant are only those which are asso- 

 ciated with growth and not with differentiation, with trophic as 

 contrasted with morphogenetic processes. 



Supplementary Note. After this paper had gone to press I 

 received an important publication by S. Morgulis entitled 

 "Studies of Inanition in its Bearing upon the Problem of 

 Growth," Arch. f. Entw.-Mech., Bd. 32, 1911. The author 

 finds that both the size and number of cells are decreased in 

 starving animals. Experiments of my own on starved planarians 

 yield the same result. 



LITERATURE CITED 



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 Berezowski, a. 1910 Studien ueber die Zellgrosse, I. Arch. f. Zellforschung, 

 Bd. 5. 



1911 Studien ueber die Zellgrosse, II. Idem. Bd. 7. 



BovERi, Th. 1904 Ergebnisse ueber die Konstitution der chromatischen Sub- 



stanz des Zellkerns. Jena. 

 Chambers, Robert 1908 Einfluss der Eigrosse und der Temperatur auf das 



Wachstum und die Grosse des Frosches und dessen Zellen. Arch. f. 



mik. Anat., Bd. 72. 

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Amer. Morph. Society. Science, January 10. 



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Hist., vol. 28. 

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Arch. f. Entw. Mech., Bd. 6. 



1900 Die isolierten Blastomeren des Echinidenkeimes. Idem., Bd. 10. 

 Gates, R. R. 1909 The stature and chromosomes of Oenothera gigas, DeVries. 



Arch. f. Zellforschung, Bd. 3. 



