6 H. L. Russell. 



The above table indicates that a number of different forms which 

 are ordinarily saprophytic in their method of nutrition, are able to 

 exist within the plant for a considerable period of time, and in some 

 cases show evidence of a considerable increase. This multiplication 

 does not, however, reach a stage macroscopically observable. There 

 is usually a slight "browning" or discoloration of the tissue at the 

 seat of inoculation, but this is due to the slight injury caused by the 

 inoculating needle, even though the opening is protected from the 

 influence of the air by vaseline. 



The results which were obtained by Lominsky 1 in regard to the 

 growth of Bac. prodigiosus I was unable to confirm. He states that 

 this germ, inoculated into the leaves of certain plants, produced 

 brick-red spots and stripes which were to be seen by the naked eye. 

 In the above experiment bacteria were demonstrated as present in 

 large numbers in tissue even after a considerable lapse of time, 

 but no signs could be detected of a change in the cellular structure 

 in any case. 



In regard to forms which are naturally pathogenic for animals, we 

 might expect a priori that they would be unable to survive for such 

 a length of time, or show as marked an increase, as saprophytic forms, 

 which are, as a rule, less sensitive in regard to the substratum for 

 their development. This expectation was realized, as will be seen 

 from the subjoined table, which comprises those forms that are 

 natural facultative parasites on animals. 



In this group of parasites I find, with but few exceptions, that 

 they are unable to compete with the unfavorable environment to 

 which they are subjected in the plant. The large majority of them 

 are not able even to hold their own, but gradually succumb to their 

 unfavorable surroundings. Here again I failed to verify some of 

 the results obtained by Lominsky. His experiments were confined 

 to the action of plant-tissues upon anthrax, the typhoid bacillus, and 

 Staph. pyog. aureus. He made quite a number of experiments, and 

 found that both the anthrax and the pyogenic organism increased and 

 were able to form colonies in the tissues. Anthrax grew rapidly 

 for a time, formed spores, and finally seemed to undergo degen- 

 eration. The typhoid-fever bacillus was unable, however, to live 

 beyond a few days, and even then showed degenerating peculiarities. 



1 Loc. cit. 



