1098 



REPOET OF COMMISSIONER OF FISH AND FISHERIES. 



M 



G. maculata. I also believe the same design will work with cod or other 

 floating eggs, and probably with much greater success, as the eggs are 

 less delicate. 



view of braces inside, 



:V'1>o>'^'' 



Clamp 



, Fig. 2. — Apparatus proposed for Latching floating eggs. 



As to the best apparatus I submit one shown in Fig. 2, I will describe 

 the apparatus entire and name its advantages as they have appeared to 

 me. It is drawn to a scale of 2 inches to the foot. The aquarium is to 

 be of glass and 24 inches in diameter and 20 inches in height. A hole 1^ 

 inches in diameter is to be made on one side of the aquarium, the center 

 of which is to be 8 inches from bottom of aquaria. Through this is 

 passed a flve-eighths-iuch piece of glass tubing, having a caliber of one- 

 half inch ; this to be bent in manner shown ; over the inner extremity of 

 this a blocli-tin strainer is passed and attached. The strainer, as shown, 

 has a deiJth of 4 inches, the lower 2 inches convex, the upper 2 inches 

 in shape of a truncated cone, the apex 1 inch across the base, with a 

 diameter of 4 inches; the two pieces to be soldered together, and, to 

 prevent separation, the upper lip of convex portion is to be bent inwards 

 at a right angle, and directly rest upon the lower border of cone, which 

 is bent outward :it right angles to receive it. 



To prevent collapsing, two pieces of block tin 1 inch in width and 

 one-eighth inch in thickness cross each other and have their extremities 

 firmly soldered to the junction of upper and lower half of strainer on 

 the inside. These at their center are perforated to admit the extremity 

 of three-fourths-inch glass exit tube. The truncated portion of cone may 

 be made to fit the glass tube very tightly by rubber packing. The joint 

 where the glass exit tube passes through the sijle of the aquaria must 



