Fearnoiv. — Transporting Live Fish. 103 



the container and its inside flap folded in and down over the edge 

 of the outside receptacle. The upper tray is placed within the re- 

 ceptacle and the inner flap of the absorbent jacket is thus held 

 in position between the outer receptacle and the upper tray, the 

 width of the flap being sufficient to permit it to extend below the 

 bottom of the upper tray. The jacket is then moistened and is 

 maintained in that state by the wick-like action of the flap. The 

 evaporation of moisture in the jacket absorbs the atmospheric heat, 

 thus keeping the water sufficiently cool for warm water fishes. 



AERATION. — HOW ACCOMPLISHED. 



The automatic aeration is accomplished in the following man- 

 ner : The fish in the bottom tray are compelled to remain near the 

 surface of the water, where the greatest amount of oxygen is 

 present When the container is in motion its swaying and jolting 

 will cause the water in the outer receptacle to move from side to 

 side. Since water presses equally in all directions, and the body 

 of water in the lower part of the outer receptacle entirely fills the 

 space between its bottom and sides and the bottom of the lower 

 tray, this body of water can move only by virtue of the air space 

 of the splash chamber between the sides of the outer receptacle and 

 lower tray. The result is that a portion of the water will be forced 

 up into the air space with considerable violence by 

 the mass movement of water in the lower part of the outer recep- 

 tacle, and will pass in small jets from the space into the lower tray, 

 not only through the perforations in its sides, which are below the 

 normal surface of the water, but also through the perforations 

 Vv'hich are above the surface of the water, falling therefrom through 

 the air into the lower tray and becoming aerated by its passage 

 through the air. 



The amount of water thus forced into the lower tray will, 

 because of the pressure to which it is subjected, be somewhat 

 greater than the quantity that will flow out by its own weight 

 through the limited number of perforations below the surface, 

 with the result that the water level in the lower tray will be raised 

 until a point is reached where the perforations submerged by the 

 water within the lower tray are sufficient to compensate for this 

 forced injection. In this way a higher level of water is maintained 

 and it affords the fish greater freedom of action while the vessel is 

 in motion. 



