THE CELLULAR CHANGES OF AGE 



69 



one, is offered us by the changes which go on in the 

 nerve cells in extreme old age. This is beautifully 

 illustrated by the two pictures which are now before 



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FIG. 24. GROUP OF FOUR NERVE CELLS FROM THE 

 FIRST CERVICAL GANGLION OF A MAN DYING OF OLD 

 AGE AT NINETY-TWO YEARS. Specimen preserved with 

 osmic acid. C, C, two cells still intact, but loaded with 

 pigment granules ; c, c, two cells which have disinte- 

 grated. X 500 diams. After C. F. Hodge. 



us, copied from investigations 1 of Professor Hodge, 

 of Clark University. The two figures represent 

 human nerve cells taken from the root of a spinal 



1 C. F. Hodge, " Changes in Ganglion Cells from Birth to Senile Death," 

 Journal of Physiol. , vol. xvii., pp. 129-134. 



