13 



with the tail of a male fish still bearing traces of the 

 milt. 



8. After a few moments 7 repose, pour off the water 

 slowly and put in more. 



9. Before the mixing, the eggs will be observed to be 

 of a pale orange-colour and very transparent; after it 

 they become brownish, and a small black spot is perceived 

 in the middle. 



10. Change the water once or twice. 



1 1 . The fecundation being now complete, some of the 

 eggs will be perceived to be white. These are the sterile 

 ones, and must be picked out, otherwise they will corrupt 

 the rest. 



Having proceeded so far, the next operation is to pro- 

 vide for the preservation of the eggs. 



12. Take a round box in the form of a warming-pan, 

 with the centre of the bottom pressed in, so as to cause 

 it to stand firmly. Let the box be made of zinc, to 

 prevent rust. Let it be eight inches in diameter, with a 

 lid one-and-a-half high, opening with a hinge. Riddle 

 it completely with small holes in all directions, and let 

 the edges of the holes be quite smooth. 



13. Place in the box a layer of fine gravel. 



14. Then take about one fish's spawn of the fecundated 



15. Close the box, place it in the bed of a current of 

 pure water, cover it with shingle and pebbles, and leave 

 it ; but see that the water passes freely through it, as it 

 is necessary for the eggs to be slightly agitated. 



This done, the operator must wait until the time shall 

 arrive at which the exclusion, or hatching of the eggs, 

 will take place. The period varies from two to four 

 months. It cannot, however, be fixed with any preci- 



