784 rEPORT—1899, 
5. The Fur Seals of the Behring Sed: 
By G. E. H. Barrerr-Hamirron,. 
6. Report on Bird Migration in Great Britain and Ireland. 
See Reports, p. 447. 
7. Report on ‘ Index Animalium.’ See Reports, p. 429. 
8, Report on the Zoology of the Sandwich Islands. See Reports, p. 436. 
9. Report on Zoological and Botanical Publications. See Reports, p. 444. 
10. Report on the Zoology and Botany of the West India Islands. 
See Reports, p. 441. 
TUESDAY, SEPTEMBER 19. 
1. Expériments on the Artificial Rearing of Sea-Fish. 
By W. Garstang, MA. 
Recent experiments at the Plymouth laboratory with the larve of the Butterfly 
Blenny (Blennius ocellaris) have shown that under suitable conditions the 
metamorphosis of Teleostean larvee can be completed with a death-rate not 
exceeding 30 per cent. or 40 per cent. of the original numbers. The failure of 
MM. Fabre-Domergue and Biétrix in their experiments upon Cottus, and of 
Cunningham in the case of other fishes, is probably to be attributed to their 
employment either of absolutely stagnant water or of water in a state of 
very slow circulation. In my experiments the mortality in the early stages 
of development, when stagnant water was employed, was invariably very 
high. The larvae remained inactive and refused to feed, exactly as in the experi- 
ments of the French observers. But if during the first week of development the 
water was kept in a constant state of gentle agitation by means of the ‘plunger’ 
devised by Messrs. Allen and Brown, the larve remained healthy and active, and 
were incessantly on the look-out for food particles. On the other hand, agitation 
of the water appears to be unnecessary in the later stages of development, for if 
the larvee are kept healthy in agitated water during the first week of their 
development they may complete their metamorphosis in absolutely stagnant water, 
provided it is properly oxygenated and supplied with food, and is kept free from 
the accumulation of organic débris. 
The success of my later experiments was so complete that I propose to continue 
them on a larger scale during the’coming spawning season with the larvae of 
food-fishes, in the hope of throwing light upon the difficult problems of sea-fish 
culture. 
9, Plaice Culture in the Limfjord, Denmark. 
By Dr. C. G. Jou. PEreksen, 
The Limfjord runs right across the northern part of the peninsula of Jutland, 
there being an entrance from the North See at Thyborén, and another from the 
