THE plan I have followed in this work has been to sift and arrange the facts I have gathered concerning the habits of the animals best known to me, preserving those only, which, in my judgment, appeared worth recording. In some instances a variety of subjects have linked themselves together in my mind, and have been grouped under one heading; consequently the scope of the book is not indicated by the list of contents: this want is, however, made good by an index at the end.

It is seldom an easy matter to give a suitable name to a book of this description. I am conscious that the one I have made choice of displays a lack of originality; also, that this kind of title has been used hitherto for works constructed more or less on the plan of the famous Naturalist on the Amazons. After I have made this apology the reader, on his part, will readily admit that, in treating of the Natural History of a district so well known, and often described as the southern portion of La Plata, which has a temperate climate, and where nature is neither exuberant nor grand, a personal narrative would have seemed superfluous.

The greater portion of the matter contained in

VI

Preface.

this volume has already seen the light in the form of papers contributed to the Field, with other journals that treat of Natural History; and to the monthly magazines :--Longmans', The Nineteenth Century, The Gentleman's Magazine, and others : I am indebted to the Editors and Proprietors of these periodicals for kindly allowing me to make use of this material.

Of all animals, birds have perhaps afforded me most pleasure; but most of the fresh knowledge I have collected in this department is contained in a larger work (Argentine Ornithology), of which Dr. P. L. Sclater is part author. As I have not gone over any of the subjects dealt with in that work, bird-life has not received more than a fair share of attention in the present volume.