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THE ORGANIC CELL 
of the whole maintained ; for upon this very problem depends 
the question of the transmission of acquired characters, and 
more important still our very conception of life itself. 
When making a study of the single cell, one regards it as an 
independent organism. It can only be such, however, in 
Cells, showing the typical parts. — A. Showing two centrosomes. Nucleus 
with net- knots (Flemming). B. Aster, containing a single centrosome. Nucleus 
with single plasmosome (Hermann). C. Special ganglion of a frog. Attraction 
sphere containing a single centrosome, with several centrides (Lenhossek). 
X>. Nucleus in the spireme stage. Centrosome single ; attraction-sphere well 
seen (Hermann) 
unicellular plants and animals, and in the germ cells of multi- 
cellular forms. Looked at from one point of view it cannot be 
denied that the multicellular body is equal to the aggregate of 
the one-celled forms which make up its constitution. One 
cannot quarrel with the aphorism that the whole cannot consist 
of more or less than the sum of its parts. Speaking physio- 
