36 
THE ORGANIC CELL 
Nussbaum took the infusorian Oxytricha and cut it into 
two portions, one portion containing the nucleus, the other 
fragment being without any trace of nuclear material. The 
wound in the nucleated portion quickly healed, the missing 
portion became regenerated, and a perfect form resulted. The 
enucleated portion, which consisted only of cytoplasm, showed 
ao signs of vital reaction, and rapidly died. Nussbaum con- 
Regeneration in Stentor. 
A. Divided into three parts, each containing portion of the nucleus. B. The 
three portions shortly afterwards. C. After twenty -four hours, each forming 
a perfect animal. (After Gruber.) 
eluded from the above that the faculty of constructive meta- 
bolism, or it may be termed the power of regeneration, was 
inherent in the nucleus. 
Gruber repeated these experiments on another infusorian, 
Stentor. A fragment which contained a large portion 
of the nucleus underwent complete recovery and regeneration 
in twenty-four hours. A fragment possessing only a small 
particle of the nuclear material substance recovered very 
slowly. Any portion in which there was no nuclear material 
present showed no signs of regeneration, though it might 
continue to live for some time. It has been further demon- 
