58 FISH CULTUEE. 



The out-door apparatus usually commands a much 

 larger stream, and here deposits are less felt, and 

 putrefaction is more liable to be carried off to some 

 extent by the greater body of water ; therefore, gravel 

 ■wUl answer there tolerably well. Moreover, when 

 the ova are hatched in the large out-door trays, the 

 greater part of the produce must stay where it is 

 hatched ; it cannot be drawn off into a can and re- 

 distributed as it can from the indoors tray and grille. 

 Besides, the spaces are much larger, and the glass 

 rods less applicable ; so that on the whole I think 

 for indoor apparatus the grilles are best, and for 

 outdoor perhaps the gravel is preferable. Having 

 determined this knotty ■ point, I will mention one 

 more species of apparatus applicable to streams, and 

 that is the floatiag apparatus. Have a basket made 

 of fine close wicker-work, somewhat similar in form 

 to those baskets known as flats; on the bottom of 

 this the eggs should be deposited, and the flat moored 

 in a clear stream, so as to avoid swaying about, and 

 loaded so much as to sink it about an inch or so in 

 the water. This is a very handy style of apparatus 

 where a side stream cannot be cut off, and where the 

 last-described plan is not applicable. 



We will now suppose that the apparatus is ready 

 for the ova. We will, if you please, go to the river- 



