=⁂Books of Reference about Animals.=--Rolleston: _Forms of Animal
Life_. Huxley: _Anatomy of Invertebrated Animals_ and _Anatomy of
Vertebrated Animals_. Lankester: _Treatise on Zoölogy_. Parker and
Haswell: _Text-Book of Zoölogy_. Kingsley: _The Standard Natural
History_ and _Elements of Comparative Zoölogy_. Newton: _A
Dictionary of Birds_. Headley: _The Structure and Life of Birds_.
Wilson: _American Ornithology_. Audubon: _Ornithological Biography_.
Coues: _Key to North American Birds_. Chapman: _Handbook of Birds of
East North America_. Bendire: _Life Histories of North American
Birds_. Comstock: _Insect Life_. Packard: _Text-Book of Entomology_
and _Guide to Study of Insects_. Howard: _The Insect Book_. Beddard:
_Text-Book of Zoögeography_. A. Heilprin: _The Geographical and
Geological Distribution of Animals_.