ON THE NATURE OF MITOCHONDRIA 465 
GENERAL RESUME 
From the evidence that has been submitted in this study, in- 
cluding sections I and II in a former paper, the author believes 
that he has demonstrated the following facts: 
There is no fundamental difference in the staining reactions of 
mitochondria and bacteria. 
There is no fundamental difference in the reactions of bacteria 
and mitochondria to certain chemicals that have been used in 
attempting to determine the chemical nature of mitochondria. 
Mitochondria may be demonstrated by bacteriological 
methods. 
Bacteria may be demonstrated by mitochondrial methods. 
Mitochondria vary in fragility. 
Bacteria vary in fragility. 
Mitochondrial substance is apparently miscible with the 
cytoplasm of the host cell. 
The author, further, believes that the following apparent 
facts and biological principles support a bacterial nature of 
mitochondria: 
Similarity of form. 
Similarity in staining reaction. 
Similarity in chemical ractions. 
Similarity in physical properties (fragility). 
Similarity in functional properties (synthesis). 
In harmony with principle of biological behavior as exempli- 
fied in the ‘struggle for existence’ resulting in symbiosis. 
In harmony with known factors of evolution. 
In harmony with known factors of cell activity. 
In harmony with ‘principle of cell dependence.’ 
In harmony with the principle of analogy (Bacillus radicicola, 
lichens). 
