. Text-book of zoology for schools and colleges. Zoology. ORDERS OP INSECTS. 161 the duties necessary for the preservation of the colony, such as procxmng food, building the nest, and feeding the young. As there is only one set, or " caste," of neuters, the duty of. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Nicholson, Henry Alleyne, 1844-1899. New York, D. Appleton and Co.

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RM2ANFR99–Zöology; a textbook for colleges and universities . ear. Directions aregiven for preventing the spread of infection from casesof communicable disease; and instructions are furnishedfor the care of ones self and ones family in cases ofaccident or sickness. The author has desired to keep thebook rather brief, and for this reason has introducedonly those topics on which women and girls seem par-ticularly to need instruction. The text is adapted for use as a beginners book forclasses in hygiene and home nursing in high schools,colleges and schools for nurses. Cloth. Profusely illustrated.<vii -

RMRE0FJF–. Text-book of zoology for schools and colleges. Zoology. DIVISIONS OF EEPTILIA. 251 Secondary period of geology. The most familiar examples are the so-called Pterodactyles, and the distinguishing charac- ters of the order have reference to the fact that they were all adapted for an aerial life. They present, in fact, an extraor- dinary combination of the characters of birds and reptiles, and they make also some approach to the Mammalian order of the Bats. In the presence of teeth in distinct sockets, and, as we shall see hereafter, in the structure of the fore-limbs, the Pterodactyles differ

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