Germ of the Southern Cattle Plague. 121 
member of this class of “ belted” germs, and should be classed as 
extra-organismal, local or land septicemie. It seems to me that 
the germ of Yellow Fever, as well as the disease itself, should also 
come into this group.' I am sorry to say that, notwithstanding the 
results claimed by Freire, I am unable to find a single exact and 
detailed description of the germ with which he works, and which 
should therefore be the etiological moment in the Yellow Fever, if 
there is any trustworthiness in Friere’s statements. 
MorPHO-BIOLOGICAL RESEMBLANCES NOT SUFFICIENT TO PRo- 
NOUNCE PATHOGENETIC GERMS OR DISEASES 
CAUSED BY THEM IDENTICAL. 
This part of my work would be left incomplete did not I allude 
to an endeavor of Hueppe’s to show that the diseases named above, 
aside from the Swine and Southern Cattle Plague of this country, 
are identical, that is, the German, Schweine-Seuche, Hiihne-Cholera, 
Kaninchen Septikamie und Wild Seuché must all be one and the 
same disease; because their germs have each and all the same form, 
the same size, the same “ belted” appearance, and because they all 
grow alike in bouillon, on agar agar and in gelatine. 
The Germans do not say anything as to how these germs deport 
themselves on potatoes. The Schiitz-Loeffle germ does grow on pota- 
toes, as Professor Kitt, of Munich, assures me. 
No greater or more misleading statement could be made, or per- 
haps it would be better to say principle or theory enunciated. 
The most complete morphological resemblances and exact mor- 
pho-biological relationship in or on artificial media are not suffi- 
cient grounds for any such attempt at generalization as Hueppe’s in 
the case of these diseases. 
To all beginners in this work, and all older hands as well, I most 
emphatically assert that there is but one factor in the biology or 
morphology of etiological micro-organism which can decide whether 
_ two germs apparently alike are one and the same object, when de- 
rived from two distinct diseases of animal life. 
That factor is a physio-chemico-biological one. Both germs must 
produce the same disease in both species of animals: the same chemi- 
cal and pathological phenomena which ocerr in the same diseases and 
eloa E eo stated by researches subsequent to the prepara- 
* Colin says the same. 
