I had no means of judging its depth into the rock. The base of
the island is wholly composed of limestone, in which shells scarcely, if
ever, appear."
_Conchology--Mineralized Fungus, &c._--Dr. Samuel L. Mitchell, of New
York, writes (Jan. 30th): "I was glad to receive your letter and the
accompanying articles, by the hand of Colonel Gardiner; but I am sorry
your business is such as to prevent your meditated visit to the city
until spring.
"I had a solemn conference with Mr. Barnes, our distinguished
conchologist, on the subject of your shells. We had Say's publication on
the land and fresh water molluscas before us. We believed the univalves
had been chiefly described by him; one, or probably two of the species
were not contained in his memoir. It would gratify me very much to
possess a complete collection of those molluscas. I gave Mr. Barnes, who
is an indefatigable collector, such duplicates as I could spare.
"I showed your sandy fungus to my class at the college yesterday. Our
medical school was never so flourishing, there being nearly two hundred
students.
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