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Part second. 



The first part presented the animals and plants to the visitor as 

 they are found in the separate tanks of the Aquarium, mentioned 

 their names and gave at the same time pictures so that the names 

 could the more easily be applied to the right objects. But the name, 

 shape and colour is only, so to speak, the 'outer shell' and however 

 pleasing this may be to the eye, it does not alone satisfy. Rather 

 it gives rise to the desire for a clear acquaintance with these often 

 wierd-looking creatures, to learn more of their homes, the way 

 they are caught, their life in captivity and further, to know a little 

 of the results of the researches on their organization, development 

 and functions which have been carried on for more than four 

 decades by investigators from all nations in the other depart- 

 ments of the Zoological Station. It is hoped that the second part 

 of the Guide will, to a certain extent, fulfill this wish, and this 

 is undertaken with the more pleasure as the visitor to the Aqua- 

 rium has himself a share in these investigations: his visit gives 

 a contribution towards procuring the numerous and costly weapons 

 with the aid of which the biologists in the Zoological Station 

 attack the problems of their science. 



The order followed here must be a different one from that in 

 the first part, the order, namely, of the classification of animal 

 life based on anatomical and genealogical considerations, rising 

 from the simplest organisms to the highest, the Vertebrates. In 

 museums no such double arrangement is necessary in description, 

 as the stuffed or spirit specimens can be placed at will in the 

 order of the zoological system. As long, however, as they still 

 live one must remember that each beast has its little ways and 

 according to these prejudices it must be treated. If it is to flourish 

 it must be placed in suitable surroundings and company without 

 any regard to genealogy. The only disadvantage is that the ar- 

 rangement in the second part of the Guide makes it necessary 

 for the visitor to wander in a zig-zag through the Aquarium to 

 seek out the animals described. 



Before we occupy ourselves, however, with the separate divi- 

 sions of the animal kingdom, we will make a few general remarks. 



