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true, be considered as settled.” ‘‘ But” he adds ‘“‘so far as we have 
yet considered the subject, there may be just as good evidence to 
show that Bacteria and Torul are capable of arising de novo, 
as there is that some of them are capable of developing into fungi.” 
He next discusses the heterogenetic origin of Bacteria and Toru- 
æ :— , 
“It has long been known that Bacteria and Torulæ are fre- 
quently to be found within vegetable cells, taken even from the 
central parts of plants whenever these are in a sickly condition or 
are actually dying. They are apt to exist also within epithelial 
cells taken from the inside of the mouth; and the frequency and 
abundance with which such organisms are met with in these cells, 
is almost in direct proportion to the malnutrition and lack of vital 
power in the individual who is the subject of observation. Then 
again, in persons who have died of adynamic diseases, in the 
course of twenty-four or thirty-six hours (during warm weather), 
Bacteria may be found in abundance within the blood vessels 
of the brain and of other parts, although no such Bacteria were 
recognizable in the blood of the individual during life. 
n such cases we must in order to account for the presence 
the Bacteria or Torule are met with, are onthe eve of death), or 
else we must imagine that when the vital activity of any organism, 
whether simple or complex, is on the wane, its constituent par- 
ticles (being still portions of living matter) are capable of indi- 
vidualizing themselves, and of growing into the low organism in 
question. Just as the life of one of the cells of a higher organ- 
ism may continue for some time after the death of the organism 
itself, so, in accordance with this latter view, may one of the par- 
ticles of such a cell be supposed to continue to live after even cell- 
life is impossible.” : 
This latter theory (heterogenesis) he favors as in part account- 
ing for the production of Bacteria, as ‘evidence of a tolerably sat- 
isfactory nature, however, is forthcoming which may speak inde- 
pendently in favor of the doctrine of heterogenesis.” 
“It has been affirmed by Crivelli and Maggi that they have 
actually seen the particles within granular epithelial cells (taken 
from the back of the tongue of a patient suffering from diabetes) 
grow and elongate, so as to give rise to Bacteria, ox fuse in lon- 
gitudinal series so as to form a Vibrio. And, moreover, as I have 
