230 Dr. Mac Culloch on the Changing 
let, together with “ lupos, auratasque,” two fishes of which 
we are not now able with certainty to assign the names. 
He farther alludes to others which he has not named, as 
being “ dulcis aque tolerantia.” He then passes from the subject, 
as of too familiar a nature to require a more detailed notice; 
a stronger proof than even his enumeration would have been, 
of the facts which I have thus attempted to support from his au= 
thority, and of the established existence of a practice which we 
havelost, and appear, very strangely, to be unwilling torevive. But I 
must refer your readers to the original, for the whole of this 
curious chapter, as the translation of it would inconveniently 
prolong this paper. 
The merely temporary naturalization to our lakes and ponds in 
the case of sea fish, would be no light acquisition to the gastrono= 
mer who might desire to have turbot before the season, or to 
reserve it at five shillings. for consumption, when the price has 
risen to three guineas. If the cod chooses to live in the fresh 
lake of Stromness-voe, there is no reason why we should not keep 
them in our own gardens till the day of giving a dinner comes 
round, or why Mr. Groves should not render the Serpentine a park 
for surmullets, instead of allowing it to be consigned to frogs and 
tadpoles. It is tobe hoped that the Fishmongers’ Company will 
take these matters to heart, as in duty bound; and that, in the 
progress of perfectibility, even the odious canal in St. James’s 
Park may become a repository of turtles, instead of what it now is, 
a Stygian nursery of Malaria and his black host. 
There is a subsidiary question arising out of these speculations 
respecting the convertibility of the habits of marine animals, highly 
interesting to geology, and on which it will not be out of place to 
say a few words, although unfortunately not much solid informa- 
tioncan be procured respecting it. This relates to the power 
which many, perhaps all of the vermes inhabiting shells, possess 
of residing indifferently in fresh or in salt water. 
It is well known to geologists that with respect to many, if not 
all of those deposits supposed to have been formed, like that of 
Paris and of England, under fresh water, the question mainly rests 
