280 BULLETIN OF THE UNITED STATES FISH COMMISSION. 



over the edge of the barrel, while the other is left hanging in the water. 

 After stopping the pressure of the fingers the water flows from the free 

 end of the rubber tube and is allowed to flow through a filter (a piece 

 of coarse linen, a pocket-handkerchief, &c). The larvae are carried by 

 the current of the water into and through the rubber tube and remain 

 on the filter, on which they may be gathered in any desired quantity; 

 then, on the the improvised filtering cloth they may be transferred to the 

 fish tank, where they can easily be washed from the cloth and thus 

 brought into the water. When the water flows into the tank freely 

 the larvae are easily driven toward the exit-grate and hindered in 

 their free movements, whereby they are lost to the fish. It is, therefore, 

 advisable, during feeding, temporarily to stop the flow of fresh water 

 into the tank, or at least to diminish its force. 



This excellent live food, which can easily be obtained all through the 

 summer, does not exclude the use of fresh dead food, to which we re- 

 ferred in the beginning of this article ; and we found that very finely 

 chopped fish worms were gladly taken by the young fish. 



SI.-NUCCKNS IN HATCHING LOBSTER ECGS IN NORWAY. 



By G. M. DANNEVIG. 



[From a letter to Prof. S. F. Baird.] 



I have the pleasure of informing you that the experiments with the 

 hatching of detached lobster eggs are progressing very favorably. The 

 young are doing well, and some of them have attained what Prof. G. O. 

 Sars calls the third stage. The length of the young lobster soon after 

 hatching is about 9 millimeters; after eight days, when the second 

 changing of the shell or skin takes place, it has attained the length of 

 12 millimeters; and after sixteen days, when the third change occurs, it 

 is about 15 millimeters long. 



For some days the mortality was rather great, but now only 2 or 3 

 die in twenty-four hours; so that out of 200 picked out for an experi- 

 ment 95 still remain. They are very greedy, but not so inclined tu kill 

 one another as they were at the beginning. I feed them principally 

 with the soft parts of our crab ( Cancer mcenus, or Cancer pagurus, as some 

 call it), which they like very well ;4>ut their slender legs sometimes become 

 entangled in the soft mass, and then they die. Five hundred newly 

 hatched individuals are now in a separate apparatus for further experi- 

 ments, and I wish to find out at what stage the greatest loss takes place. 

 1 have great hopes now that I shall master this question during the 

 season, so that I can proceed on a large scale next summer. 



Flodevig, near Arenpal, Norway, July 14, 1885. 



