Just at the close of the last century, appeared the greatest "Roman of them all," the great Latreille, of France, whose name we have so frequently used in the classification of the honey-bee. His is called the Elective System, as he used wings, mouth-parts, transformations, in fact, all the organs--the entire structure. He gave us our Family Apidæ, our genus Apis, and, as will be remembered, he described several of the species of this genus. In our study of this great man's work, we constantly marvel at his extensive researches and remarkable talents. Lamark, of this time, except that he could see no God in nature, did very admirable work. So, too, did Cuvier, of Napoleon's time, and the learned Dr. Leach, of England. Since then we have had hosts of workers in this field, and many worthy of not only mention but praise; yet the work has been to rub up and garnish, rather than to create. So I will close this brief history with a notice of authors who are very serviceable to such as may desire to glean farther of the treasures of systematic entomology; only remarking that at the end of the next chapter I shall refer to those who have been particularly serviceable in developing the anatomy and physiology of insects, especially of bees. VALUABLE BOOKS FOR THE STUDENT OF ENTOMOLOGY. For mere classification, no work is equal to Westwood on Insects--two volumes. In this the descriptions and illustrations are very full and perfect, making it easy to study the families, and even genera, of all the sub-orders. This work and the following are out of print, but can be got with little trouble at second-hand book-stores. Kirby and Spence--Introduction to Entomology--is a very complete work. It treats of the classification, structure, habits, general economy of insects, and gives a history of the subject. It is an invaluable work, and a great acquisition to any library. Dr. Packard's Guide to the Study of insects is a valuable work, and being American, is specially to be recommended. The Reports of Dr. T. Harris, Dr. A. Fitch, and of Prof. C. V. Riley, will also be found of great value and interest. CHAPTER II. ANATOMY AND PHYSIOLOGY. In this chapter I shall give first the general anatomy of insects; then the anatomy, and still more wonderful physiology of the honey-bee. ANATOMY OF INSECTS.