GASTRIC CMCA OF THE HETEROPTERA. 153 



in the intestine the obligate species, as Bacillus coli, would 

 doubtless develop a certain amount of immunity to their own 

 poisons which would not be shared by other transient forms. 



According to Kohlbrugge there is an "autosterilization" of 

 the small intestine in man and the higher animals generally; 

 and normally the bacteria which occur in this part of the digestive 

 tract are found only in the food masses, so that when the intestine 

 is emptied the bacterial flora consequently disappears, leaving the 

 empty intestine practically sterile. He also found that even 

 after prolonged fasting the caecum, that portion of the digestive 

 tract characterized by the greatest development of bacteria of 

 the Bacillus coli type, always contained quantities of this organ- 

 ism; and he insists that the caecum and the vermiform appendix 

 instead of being the useless, vestigial organs that they are com- 

 monly considered, are in reality of the greatest importance to 

 the animal possessing them in functioning as a natural and safe 

 culture place for a constant reserve supply of the colon bacillus. 



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 Burrill, T. J. 



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 Cohendy, M. 



'12 Experiences sur la Vie sans Microbes. Ann. del'Institut Pasteur, T. XXVI., 



pp. 106-137. 

 Conradi, H. and Kurpjuweit, O. 



'05 Ueber spontane Wachstumshemfnung der Bakterien infolge Selbstver- 

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'12 Bull. Sci. de la France et Belgique, Vol. 46. 

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'85 Sur le germination dans un Sol riche en matieres organiques mais exempt 

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 Dufour, Leon. 



*33 Recherches anatomiques et physiologiques sur les Hemipteres. Mem. des 

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'96 On a Bacterial Disease of the Squash Bug (Anasa trislis). Bull. 111. State 



Lab. Nat. History, Vol. IV., Article XII., page 340. 

 Eijkman, C. 



'04 Ueber thermolabile Stoffwechselproducte als Ursache der natiirlichen 

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