CONTENTS. Vii 
CHAP. II. 
The Fourth Proposition considered. — The primary Types of Nature 
Page 241 
CHAP. III. 
The Fifth Proposition considered. — On the relative Rank of the different 
circular Groups in the Animal Kingdom.— On Species and Varieties. — 
On the Means thus offered by the Laws of natural Arrangement, for 
the Verification of Groups. — Familiar Illustration of the Principles of 
Classification here developed.—Questions on analogical Comparisons 266 
PART IV. 
A FAMILIAR EXPLANATION OF THE FIRST PRINCIPLES 
OF PRACTICAL AND SCIENTIFIO ZOOLOGY, WITH SUG- 
GESTIONS FOR A PLAN OF STUDYING THE DETAILS 
OF EACH DEPARTMENT. 
CHAP. I. 
Preliminary Remarks.— Distinction between practical and scientific Na- 
turalists. — Qualifications for both — as Accuracy of Observation— Per- 
severance — Concentration of Study— Memory.— Evils of indiscriminate 
collecting. — Plans for collecting recommended - - 300 
CHAP. IL 
Importance of acquiring first Principles. — Reasons for supposing a Plan in 
Creation.— Opinions thereon. — The Circular Theory, and the different 
Tests which every Circle must undergo, explained and illustrated 317 
CHAP. IIL 
On the Rank and Names of the Natural Divisions, or Groups, in the 
Animal Kingdom.— Of Species and Varieties - - - 3S4t 
