204 Modern Fishculture in Fresh and Salt Water. 



with points on it to allow the water to flow between 

 them. 



The McDonald Jar has a flat metal top screwed 

 down tight on a rubber ring ; through the top are holes 



McDonald Jar in Action. — Fig i. Jar filled with eggs 

 emptying into jar for fry, with strainer on outlet pipe. 

 Fig. 2. Aquarium jar with strainer on outlet emptying into 

 a shorter jar to prevent siphon from sucking dry. 



for two glass tubes, inlet and outlet, and these holes 

 have recesses to hold small rubber rings on which 

 hollow screws make the holes water-tight. Each of 

 these jars has its admirers. 



CHAPTER XXII. 



STRIPED BASS OR ROCKFiSH (Roccus Uneatus) . 



As the striped bass is for some unknown reason 

 called "Rock" and "Rockfish" south of N?w Jersey, I 



