122 NEW YORK ZOOLOGICAL SOCIETY 



as true and that the presence of parasites in the different biologi- 

 cal organisms with which man comes in contact is becoming 

 more generally known by their study, it is easy to see why so 

 many ardent students are found to be engaged in this interesting 

 and fascinating work. Much already has been done in finding 

 this material, })ut one may say that a mere beginning has been 

 made in the study of its future effects on man. In fact, all or 

 almost all of the germs that recently have been discovered as the 

 causes of different diseases, are parasites or their products, and 

 pathology is becoming largely influenced by a knowledge of this 

 fact. 



To return to our immediate work at the Aquarium in New 

 York and to the Zoological Park, I have to say that Dr. Townsend 

 has been unremitting in his kindly endeavor to place at my dis- 

 posal an immense amount of varied material which I have en- 

 deavored to make as much use of as possible, and I wish here to 

 thank him for his kindness and also for his intelligent endeavor 

 to let me have such material as promised results of the first order. 

 At the Zoological Park, too. Dr. Hornaday has hitherto allowed 

 his assistants to place at my disposal such material as I thought 

 would prove of interest and use to humanity, and I here wish to 

 publicly thank him for his kindness since he thus recognized that 

 it would not be his fault if my endeavors did not produce the 

 results which he and the rest of us hoped would follow. 



I must not omit in this report, however, to thank Mr. Madi- 

 son Grant for his unfailing response to any request I have had 

 to make which he deemed consistent with the interests of the 

 Society. 



I had hoped to be able to give a detailed account of the 

 diseases and ravages of parasites among the fishes and animals 

 that have fallen under my notice during the term of my position 

 as pathologist, but as I am limited for space I must refer those 

 interested to my numerous papers of the work done for the 

 Society until I may have an op])ortunity to take up the subject 

 as a specialty. 



Respectfully submitted, 



G. A. MacCallum, 



Pathologist, N. Y. Zoolof/ical Society. 

 January 1, 1921. 



