XX PRESIDENTIAL ADDRESS. 



that the laicro-organisins were undergoing degenerative changes 

 Avhich would readily account for their scarcity in the indurated 

 tissues. 



The second case I wish to bring under notice is that of a 

 high-class pedigree bull belonging to a well-known breeder in this 

 colony. The owner came to nie and stated he believed that this 

 valuable animal, which he had only recently imported, was 

 aflfected with tubercular tumours in the lower region of the throat, 

 which if it should be true would mean the immediate destruction 

 of the animal and perhaps a claim for compensation against the 

 original owner of the animal in England. During the cold 

 weather the animal, which was extremely quiet and good- 

 tempered, was kept in a stable, with a halter round its neck. 

 Apparently by continual friction of the rope, the skin of the neck 

 got rubbed so much immediately above one of the tumours as to 

 cause an open sore, which gradually increased in size. In the 

 course of a few weeks one of the tumours commenced to discon- 

 nect itself from the surrounding subcutaneous tissues, and 

 eventually sloughed out. The tumour, which was about the 

 size of an orange and very firm in consistency, was forwarded to 

 me for microscopical examination, which proved as difficult a 

 task as in the previous case. However, after repeated examina- 

 tions I was again successful in demonstrating that the tumour 

 was one of actinomycotic origin, and, as in the case of the 

 mammary gland, the fungus was undergoing calcareous degenera- 

 tion. The second tumour was subsequently removed by operation, 

 and on microscopical examination turned out to be, as was 

 anticipated, of the same character as the first tumour. Although 

 this event took place two years ago, the animal has never 

 exhibited any further manifestation of this disease ; in fact at the 

 present time, I am informed, he is a perfect picture of health. 

 Needless to say the owner was more than gratified at the result of 

 these examinations, and even now frequently sings praises of the 

 valuable assistance which the microscope rendered in saving the 

 life of what is at the present time a champion animal of his 

 class in Australia. 



TUBERCULOSIS. 



There is no known disease which has a wider distribution 

 than tuberculosis. The study of this disease in all its mani- 



