6. What precautions must be taken in raising chickens so as to prevent disease and attacks of enemies? 7. What does it cost per year to keep a dozen hens? How many can a person keep profitably on a city lot, if he is not to make a special business of chicken raising? 8. How do chickens solve the problem of the garbage can? 9. What are some of the objections made to keeping chickens in the city? Are these objections well founded, and if so how may they be met? 10. Find out what breeds of chickens are kept in your neighborhood, and note some of the reasons that are given for keeping these particular breeds. GLOSSARY #Ab do' men#, (1) the hinder portion of the body of an invertebrate; (2) of higher animals, the region or cavity containing the stomach, intestine, etc. #Al bu' men#, (1) a proteid substance; (2) "white of egg." #A' nal#, pertaining to the anus, or hinder opening of the intestine. #Anal fin#, a ventral median fin of fishes, just back of the anus. #Animal Communities#, associations of many animals of the same species. #An ten' na#, a segmented sensory appendage on the head of an arthropod. #An ten' nule#, a small antenna. #An te' ri or#, farther forward, in front of; at the head or forward end. #A or' ta#, a large artery arising at the heart and forming the trunk of the arterial system. #Ap' er ture#, an opening. #Ap pend' age#, a projection from the body, usually one of a pair. #Ar throp' o da#, a group of animals with a segmented trunk and paired, segmented appendages. #Ar ti o dac' tyl#, an ungulate with an even number of toes. #A sex' u al#, without sex. #Au' di to ry#, pertaining to hearing. #Barb#, one of the lateral outgrowths of the shaft of a feather, forming the vane. #Barb ule#, a small outgrowth of the barb of a feather. #Bi lat' er al sym' me try#, having the right and left sides mirror images one of the other. #Body cavity#, the space between the body wall and the alimentary canal. #Body-wall#, the outer wall in bodies of the many-celled animals. #Budding#, a form of fission in which a cell or portion of the body forms a small protuberance or bud, which is then cut off from the parent and forms a new individual. #Canals#, channels through the body-walls of sponges. #Car' a pace#, the shell which covers a portion or all of the cephalo-thorax in crustaceans. #Car' di nal#, pertaining to a cardo or hinge. #Car niv' or ous#, flesh-eating. #Car ot' id#, a large artery which supplies the brain and head with blood. #Car' pal#, a bone of the wrist. #Cat' er pil lar#, the larva of a butterfly or moth. #Caud al#, pertaining to the tail. #Cell#, the smallest living unit. #Cell-wall#, the lifeless membrane surrounding many cells, secreted by the protoplasm. #Central cavity#, the cavity surrounded by the body-wall in the simpler many-celled animals, as in the sponges. #Ceph a lop' o da#, the class to which the squid, octopus, nautilus, etc., belong.