THE MAMMOTH CAVE. 95 
Having now given Prof. Agassiz’s general 
views upon the natural history of the eyeless 
animals of the Cave, we will proceed to the 
anatomical construction of the organs of sight 
and hearing of the blind fishes, in the words of 
Professor Jeffries Wyman, which we take from 
Silliman’s “American Journal of Science and 
Arts” for March, 1854, page 228. He says: 
which are almost white at the time of their birth, were reared in 
total darkness, they would in like manner be white. 
“T have seen living sirens from the caves of Africa, without a 
particle of coloring matter in their skins, and so transparent that 
the form and pulsations of the heart and the circulation of the 
blood could be discerned through the walls of the abdomen and 
chest; and Dr, Blackie has informed me that he has seen similar 
colorless salamanders in the dark caves of Northern Georgia. 
‘‘T have in my possession specimens of the blind fish (Ambly- 
opsis speleeus), the blind cray-fish (Astacus pelluczdus), and of the 
crickets with eyes, of the dark caverns of the caves of Kentucky, 
which are entirely wanting in coloring, resembling albinos. The 
absence of the ball from the socket of the eye in the blind fish, 
and the absence of the eye from the peduncles of the blind cray- 
fish, may be most philosophically attributed to the absence of that 
“agent upon which the production of color depends. And 7¢t 7s 
now well estableshed that we may arrest and alter the develop- 
ment of the tadpole, and other animals, by raising the amount 
of physical forces, heat and light.” —Observations and Researches 
on Albinism in the Negro Race. By Joseph Jones, M.D., Pro- 
fessor of Physiology and Pathology in the Medical Department 
of the University of Nashville, Tennessee, Published in the 
Transactions of the American Medical Association, vol. xx., 
1869, pp. 703, 704. 
