The Naturalists' Companion. 
133 
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EXCHANGES. 
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exchanges free of charge. KO advertisements admitted to this 
column under any eireunistances , and we shall reserve the 
right to insert no exchanges which are merely intende<l to se¬ 
cure cash purchasers.—Ed. 
F. C. Johnson, 243 W. 123 Street, 
New York city.—Books, minerals,fossils 
and a pair of good ice-skates, size 9^, 
(have been worn but ouce) for books on 
amateur photography or natural history. 
Chas. P. Guelf, Brockport, N. Y., 
U. S. A.— 5 Vols. Golden Days, an 
accordion, and a book entitled 'Woung 
Trail Hunters,” for all kinds of natural 
history specimens, or scientific books 
instruments. Correspondence desired 
with collectors in foreign countries for 
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Send list of specimens for exchange. 
G. F. Guelf, Brockport, N. Y.—A 
violin and bow, in good condition, for 
the best offer in birds’ eggs. 
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Ind.—Will exchange story and other 
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fossils, birds’ eggs, curiosities, stamps, 
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eign stamps for every match, medicine, 
playing card or official stamp received, 
or for eagle or large copper cents, 
- —- 
ABNORMAL EGG. 
A hen’s egg, a little while ago, was 
observed to have another complete egg 
within it. Being asked for an explana¬ 
tion, Prof. Huxley replied—-“It is very 
simple. Reversed peristaltic action 
takes place in the oviduct after the shell 
is formed, the egg is driven back, and 
when again descending gets a coat of 
yelk, albumen, and shell.” Five simi¬ 
lar eggs are described also in the cata¬ 
logue of the teratological series of the 
Royal College of Surgeons. In the case 
of canaries, two such occurrences are 
recorded; in one of which three biids 
were actually hatched from two eggs, 
and in the other case five birds were 
hatched from four eggs.—A. W. 
Harrison, in Naturalist’s World. 
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