V THE INTERNATIONAL FISHERIES EXHIBITION 209 



particular fishing operations, as shown by statistics, 

 or of the effects produced by particular methods of 

 preservation and culture : further, a special know- 

 ledge of those parts or qualities in economic fishes or 

 molluscs which are of commercial value, and a know- 

 ledge of methods of improving or securing those parts 

 or qualities. This group of topics constitutes what 

 may be called Pisciculture. 



Coming under the first head of Systematic 

 Zoology there are some valuable collections in the 

 present, Exhibition, but on account of the large space 

 which they would occupy were they complete, such 

 collections are, on the whole, rather samples of larger 

 collections than attempts at complete illustration of 

 the marine or fresh-water inhabitants of a district. 

 Thus, Dr. Dohrn of Naples has sent a series of about 

 400 bottles containing specimens in a marvellous 

 state of preservation, accurately named, of the fishes, 

 Crustacea, molluscs, annelids, star-fishes, corals and 

 jelly-fish of the Bay of Naples. Mr. Oscar Dickson 

 sends also a very beautiful collection of named speci- 

 mens from the Gothenburg Museum, illustrating the 

 fauna of the neighbouring sea. Professor Lilljeborg 

 exhibits in the Swedish department a very large 

 scientifically named collection of the Crustacea which 

 form the food of many fishes in the great fresh- water 

 lakes of Northern Europe. He has especially occu- 

 pied himself with the study of these organisms, and 

 has discovered many new species ; it is worthy of 

 remark that English naturalists only two years ago 

 became alive to the fact that the same fresh-water 



