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ponds. These would be used for such seals, cetacea, and 
other marine animals as are either too large to be accom- 
modated in tanks in the buildings, or which can be most 
appropriately exhibited in such enclosures. Adaptations 
equally fitting and instructive are found in birds which 
live upon the sea or its borders ; and examples of these 
forms would be shown in the same ponds, or in appro- 
priate places upon their margins. 
4. It is well known that the distribution of plants and 
animals is limited more, perhaps, by temperature than by 
any other single cause. It is practicable to illustrate this 
great law of distribution with suitably constructed and 
properly arranged aquaria, stocked and kept supplied with 
animals and plants taken at moderate depths upon our own 
coasts. The problems connected with obtaining and hand- 
ling animals gathered at great depths present difficulties 
with which no garden should attempt to cope until it is 
completely organized. 
5. Faunal collections would compose the greater bulk of 
the marine aquaria. It is intended to group these together 
in such a way as to represent the association of the forms 
in their respective habitats. No attempt, of course, 
would here be made toward systematic grouping, but very 
dissimilar forms would be associated together, bringing 
prominently into view the geographical distribution of 
t} r pes. In qne room of suitable size aquaria would be 
devoted solely to the marine plants and animals of the 
North Atlantic, from Cape Cod northward. As a part of 
this collection a series of aquaria would be maintained for 
the exhibition of the commoner plants and animals occur- 
ring on the coast of Massachusetts. These forms could be 
permanently supplied, and, being named and described in 
a proper guide-book, would be of great interest to all per- 
sons living on the seashore. The fauna south of Cape 
