GREA T BRITAIN. 253 



bcr i oth, 1870; by the i/th the eyes and movements of 

 the young fish were plainly visible through a hand magni- 

 fier, and on the evening of the 24th (14 days after they had 

 been taken from the parent and impregnated) many shells 

 were found empty, but only one little one could be seen, for 

 they are so minute and transparent that there is but little 

 chance of finding them in a large body of water. By en- 

 closing the ova in a suspended muslin receptacle in the 

 tank several more were hatched out by the 29th. Dr. 

 Meyer, respecting the experiments made in the North 

 Sea, observes that no one has succeeded in rearing herrings 

 from artificially fecundated eggs owing to the impossibility 

 arresting the formation of hyphse of some fungus and 

 the difficulty of obtaining suitable food ; very soon after 



yolk was consumed they died. 



In an aquarium it was found (Zool. 1876, p. 4856) 

 at the young or whitebait's diurnal and nocturnal move- 

 ments were very dissimilar ; in the former period they were 

 quiet and uniform in going round their tank in one shoal, 

 but at night the shoal was broken up, each fish taking an 

 independent course for itself, darting about from side to 

 side, striking against the rockwork with effects fatal to 

 themselves, and which was only stopped by placing a dim 

 light to illuminate the outline of the rockwork. Then 

 they were most ravenous. 



Herrings live in an aquarium provided, while being cap- 

 tured, their scales are not rubbed off, and Mr. Jackson 

 suggests that the best plan is to dip them out of the sea 

 in a bucket or can and subsequently allow them to swim 

 into the tank they are to occupy. He invariably observed 

 that they swam round and round their place of confinement 

 in a circle from left to right. Occasionally one might 

 turn for a moment, but it speedily resumed its place, and 



