EESIDENT SUI'ERINTENDENT. 151 



ditions and iu what locnlities any species is found, tlie range 

 of depth, the extremes of temperature, the nature of the 

 ground, &c. ; and the information thus tabulated could at any 

 time be manipulated to show, for example, the different 

 species found in any particular locality, or the effect of 

 temperature or wind, or specific gravity of the water, &c., 

 on any species or group of animals. 



2. On small lithographed copies of the various charts, the 

 localities and range of a species or genus or group should be 

 indicated by coloured markings. 



3. And on an enlarged Admiralty chart, on which the 

 nature of the ground, currents, depths, &c., should be 

 accurately shown, the exact position of the various " stations " 

 where collecting work has been done should be marked. 



B. Meteorological observations, SjX. 



Systematic daily meteorological records should be kept, 

 both for Plymouth and for some point out at sea, say, the 

 Eddystone Lighthouse. Similarly daily records of the 

 temperature of the sea at the top and bottom, both in the 

 Sound and out at sea should be tabulated,* while finally, 

 observations on the specific gravity and composition of the 

 water in the Sound and out at sea should be regularly 

 obtained and recorded. 



C. The movements of Deep Sea Fishes. 



This, it appears to me, is one of the questions connected 

 with the Fauna most strongly pressing for attention. It 

 affects both the migratory and so-called non-migratory fishes. 

 The movements of both these classes of fish are very little 

 known, and the causes influencing their movements are, I 

 believe, not known at all. 



My intercourse with fishermen, especially with trawlers, 

 leads me to believe that much valuable information on this 



* Mr. Weldon has suggested the possibility of constructing a self-recording 

 thermometer which could be either flouted or sunk to any required depth at se;i, 

 and informs me that after cousultation he has reason to believe his suggestion 

 is perfectly feasible. 



