from those bacteria, and with it to antidote the 

 poison of the disease by successive injections into the 

 patient from whom they were obtained. This is a remark- 

 able piece of work, and has profoundly influenced medicai 

 treatment. ■ 



Much yet remains to be done; both at home and 

 abroad there are problems for our microscopes to solve. 



The living things that Leeuwenhoek saw in the tartar 

 extracted from his teeth are as great a marvel to the 

 dentist of to-day as they were to him. 



When some dental altruist prevents their growth, 

 our suff'ering molars will rival in whiteness and hardness 

 those of the beasts of the field. 



Last yea;r's copy of Punch, which we read upside 

 down whilst we waited our summons to the torture-chair, 

 will moulder in a forgotten past. Ignorance is no excuse 

 for breaking the jaw. 



From America we have perhaps the most wonderful 

 example of the value of the microscope to the surgeon. 



At Rochester, the brothers Mayo have during their 

 operations a special pathologist always present. Sup- 

 posing a patient has a tumour, whose malignancy is 

 doubtful ; the pathologist pounces upon a small portion 

 of it, which is removed under the anEesthetic, rushes into 

 an adjoining room, freezes it, cuts a section, floods it with 

 stain, and in four minutes by the clock (as I am 

 informed), comes back to the operating room with a 

 certain diagnosis. Upon this depends the extent of the 

 operation, simple removal, or removal with a wide margin 

 for safety, as in the case of cancer. What a truly 

 marvellous application of the uses of the microscope. 



Lastly, I would recall to you the entrancing Kine- 

 matograph Exhibition of Dr. Commandon's micro- 



