i86 THE SEA-TROUT 



zinc baskets, and 1 may here make a rough calculation which is based 

 upon the dimensions of the various fittings described above. One may 

 start with the assumption that 26 salmon eggs, or 26 sea-trout eggs of 

 full size, exactly occupy the space of six inches when laid side by side 

 in line. 



To take the glass grilles first. As the glass tubes set close together 

 across the frames in the hatching box (each of the four frames forming 

 a " grille ") are 6| in. in length, each row of eggs will comfortably 

 number 26, and, multiplying by go, the number of glass tubes in each 

 frame, the total number of eggs per frame will amount to 2,340, and per 

 box (multiplying by four) to 9,360. 



To take now the zinc baskets. We may count 39 eggs per row 

 along the floor space of the basket and it will be safe enough to allow 

 only 30 per row across the floor space, as there is no attempt made at 

 uniform arrangement as in the case of the grilles. Multiplying there- 

 fore 39 by 30 the number of eggs occupying in one tier or layer the 

 floor space of the basket will be 1,170, and two tiers will comprise 2,340 

 which is, oddly enough, the exact number per frame by the grille system 

 and makes the contrast very clear. Thus one zinc basket with two tiers, 

 or layers, of eggs in it holds the approximate equivalent of one frame 

 of glass grilles. But just as we had to multiply the contents of each 

 frame by four to arrive at the number 9,360, the total contents of each 

 hatching box by the " grille " system, we have now to multiply the 

 contents of each zinc basket by sixteen (for there are sixteen baskets) 

 to arrive at the full contents of a hatching box of equal size under the 

 " basket " system. Doing so, we find the total eggs in the box to be 

 37,440, rather more than four times the number treated under the 

 " grille " system. 



But there is this further to be said. It is not advisable (for 

 convenience of working) to " heap " additional eggs on the glass grilles, 

 but it is perfectly simple, and makes no difference in the ease of 



