338 FIFTEENTH ANNUAL REPORT OF THE 



Fish Disease 



On April 18, 1909, Dr. H. B. Butler, of Ogdensburg, N. Y., forwarded 

 for examination a piece of the skin of a pike perch which was affected by 

 something resembling the " carp pox " described by Dr. Hofer in his Hand- 

 book of Fish Diseases, page 61. In the case of the carp the disease is caused 

 by Myxosporidia, Myxobolus Cyprini, which are found in the kidneys and 

 sometimes in the liver and milt of the diseased fish. 



There is perhaps at this time no more important subject for the con- 

 sideration of State and Federal fish culturists than that of diseases of fish 

 causing widespread and fatal epidemics. There is no other subject which 

 has received so little attention in recent years, until within the last year 

 or two, and we are just beginning to awake to the fact that serious steps 

 must be taken, first to discover the causes of these epidemics, and second 

 to devise some treatment which will at least lessen the mortality. 



Artesian Water 



On September 27, 1909, Mr. Davidson had developed a flowing well 

 which filled a four-inch pipe, the well having a depth of only twenty feet. 

 On October 21st, Mr. Davidson had finished the third flowing well. He 

 tried to get water in two other places, but was prevented by quicksand. 



Artesian Wells 



Some difficulties have been observed in the use of artesian wells both 

 at Cold Spring Harbor and at the Pleasant Valley Stations. At Cold Spring 

 Harbor there is a tendency in certain wells to fill up with sand, which must 

 be pumped out before the normal flow of water lost by such obstruction 

 can be regained. At Pleasant Valley Station it is found that the area of 

 artesian water is rather limited, and the multiplication of wells reduces 

 the individual flow; there is also some difficulty with quicksands which 

 cause a leakage of water around the pipe and consequently a diminution 

 of the flow through the pipe. 



