BULLETIN OF THE UNITED STATES FISH COMMISSION. 259 



and forests in certain localities should be fiiruislied with Jacobi boxes, 

 which cost only 5 to G francs [96 cents to $1.10]. 



These arrangements are simple. They are long wooden boxes, with 

 gratings at the ends, and at the bottom of which there is a bed of 

 gravel on which the fecundated eggs rest. These boxes are placed in 

 running water, which passes through them by the gratings fixed at 

 each end. The eggs are therefore placed, so to speak, under natural 

 conditions. Although certain observations might be made relative to 

 this method, and although in more than one respect it leaves much to 

 be desired, it nevertheless offers great advantages. The keepers should 

 be charged to capture in the waters of their districts the necessary 

 spawning fish, and the eggs obtained from them should be hatched in 

 the waters about to be stocked. This method is not expensive and is 

 exceedingly practical, and would serve admirably to maintain a constant 

 state of production in our waters. 



Next year experiments at acclimatization may be commenced with 

 certain valuable kinds of fish, which are not yet found in Belgium, and 

 which it may be desirable to introduce. Among these we mention the 

 SalmofontinaUs and the Salmo irideus. As experience has shown, these 

 two kinds of fish seem to adapt themselves perfectly to the nature of 

 certain Belgian waters. The necessary fry will be produced, with very 

 little expense, in the hatching houses in the Government botanical 

 garden. 



It appears that a man maj^ safely transport a certain quantit}' of fry 

 at a temperature of 1° 0. [33.8° F.] in the apparatus, and of 10° 

 C. [50° F.] in the atmosphere, for a distance of more than 20 kilometers 

 [12^ miles]. Transportation in wagons for long distances has likewise 

 been perfectly successful. 



From the following observation it will be seen how important it is 

 that the air should have free access to the apparatus. An experiment 

 was made relative to the power of resistance of young fish to the diffi- 

 culties connected with transportation. Two sets of apparatus, each 

 containing 3,000 young trout, packed as described below, had been sent 

 to Jemelle, whence on the following day they were to be sent to Brus- 

 sels. On the evening before, the young fish were placed in the recep- 

 tacles, the water in which was, up to the moment of starting, being con- 

 stantly renewed. They arrived at Jemelle on March 12, at 9.49 a. m., 

 and were placed in a cellar of the station. In spite of the instruction, 

 the receptacle for the ice was left on one of them. As the temperature 

 in the cellar was only 7° C [44.6° F.] ice was not used. The tempera- 

 ture of the water was 8° C. [40.4° F.]. On the following morning, in 

 the apparatus which had been left covered only 300 young fish were 

 found alive, while in the one which had been left open there were only 

 20 dead. The heavy mortality in the first apparatus must be ascribed 

 to the circumstance that there was not sufficient air, for the young trout 



