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THE 
= AMERICAN 
NATURALIS 
A MONTHLY JOURNAL 
DEVOTED TO THE NATURAL SCIENCES. 
IN THEIR TE RRR ae ee k 
ANAGING EDIT 
Prors. E. D. COPE, Philadelphia, AND J. B: athe: Tufts College, tlas Hi, Mass. 
ASSOCIATE EDITORS: 
SD H po ESSEY, Lincoln, H, C. MERCER, Philadelphia, 
Dr. © O? WHITMAN, Chicago C. 
PROF. E. A. ao NDREWS, Palins, 
Neb 
i 
Pror. C. M. WEED, Durham, N; H., e w. Ss. aS LEY, Walerii 3 oe 
Pror. W. H. HOBBS, Madison i 
Vol. XXIX. JANUARY, 1606 
CONTE ly. 
PAGE, | 
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IN VARIATION. (Mlustrated.) a 
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