1893.] NATURAL SCIENCES OF PHILADELPHIA. 103 



its origin in the Bacteriological Laboratory of the Academy, has 

 opened up a new and wide field of important scientific medical 

 investigation. The main object of this communication, at this time, 

 is to confirm the original discovery of the branched form of the 

 tubercle bacillus by recording the observations of the same life- 

 cycle of that micro-organism found in animal tissues. I have, how- 

 ever, ventured to advance theories and results regarding the action 

 of substances far removed from the bacillus, because they were 

 suggested during my studies of the branched form of that organism. 



