388 MANUAL OF BACTERIOLOGY. 



atory animals are, however, very sensitive to the injection into 

 the tissues or veins of cultures, living or dead. They show the 

 lesions produced by various toxins, but nothing of a character- 

 istic nature. 



The bacillus is agglutinated by the patient's blood, but 

 often only late in the disease and apparently not in all cases. 

 This test seems to have only a limited value in clinical diag- 



♦U ' r .^ 



Fig. 100. — Spirillum of cholera.* (X 1000.) 



nosis. Many prefer to secure the reaction in a test-tube. 

 The dilutions used vary greatly (from i in 20 to i in 100). 

 Immunized animals develop the agglutinins in the blood. 

 Results of experiment made for the production of a curative 

 serum are encouraging. 



Torreyt comes to the conclusion that the group of dysentery 

 organisms is a large and varied one which may be divided 

 into two groups: the Shiga-Kruse group on the one hand and 



*The specimen from which this photograph was made was stained for 

 flagella. A field was selected where the organisms failed to show flagella. But 

 the method of stai.iing probably accounts for the bacteria appearing somewhat 

 thicker than they usually do in preparations. 



'\Journ. Exper. Med. Vol. VII. Feb.-Nov., 1905. pp. 365-384. 



