10 INSTRUCTION. 
to rei3resent the head of a trout, weighing a pound and a 
half, caught at Phillipse's Pond, near Smith Town, Long 
Island. The gill-rays are shown at 'No. 5. The divisions 
of the gill-cover are faintly marked in the real fish, and 
require some study. 
Lastly, the naturalist examines a fish as a jockey does 
a horse, by looking at his teeth, and with about equally 
satisfactory results. They both are bitten, whether the 
term be used in a literal or metaphorical sense. The 
writer once, after catching a large fish, having heard that 
trout had teeth in their throats, proceeded to investigate. 
Moved thereto by the spirit of inquiry, he thrust one 
finger as far as possible down the trout's mouth, and 
Avas not a little sui-prised, as well as pained, to find that 
the throat was lined with teeth sharper than a serpent's, 
and arranged in the same manner. They inclined back- 
ward, and once having penetrated a substance, would 
not and could not let go. The writer having suflered the 
agony that the pursuit of science sometimes involves, 
after exhausting gentle means of escape, and knowing 
that he could no more wear a trout, than the old man in 
the "Decameron" could the protecting ring, with a 
wrench tore away his hand, a bleeding sacrifice to sci- 
ence. Any reader wishing to ascertain the same facts, 
may pursue a similar course. 
On the foregoing diagram, which represents the 
arrangement of teeth in the salmon tribe, No. 6 is the 
upper jaw, and No. 7 the lower ; Ko. 8, the outer teeth 
in the upper jaw, superior maxillary ; ISTo. 9, the same 
in the lower jaw, inferior 'maxillary ; J^o. 10, the inner 
row of teeth of the upper jaw called learnedly the jpala- 
