CONTENTS. 
Page 
LETTER I. — INTRODUCTORY . . 1 
LETTER II. INJURIOUS INSECTS . . 7 
LETTER III. BENEFICIAL INSECTS . 19 
LETTER IV. INSECTS IN GENERAL. 
BUTTERFLIES, &C. . . .26 
LETTER V. — THE FUR-MOTH ... 51 
LETTER VI. — BEES . . .58 
LETTER VII. — BEES . . 68 
LETTER VIII. — ANTS . . 76 
LETTER IX. ANTS ..... 88 
LETTER X. — ANTS .... 102 
LETTER XI. — FLIES . ... 107 
LETTER XII. BEE-FLIES . . . 123 
LETTER XIII. — LUMINOUS INSECTS . . 138 
LETTER XIV. THE COCHINEAL INSECT, &C. 142 
LETTER XV. — IN CONCLUSION, EARWIGS, 
SPIDERS, FORNICA-LEO . . 148 
