CATALOG 1952-1953 BLY. 161.-Biology Laboratory. 4 hours laboratory. 2 credits. Prerequi- site or corequisite: C-61. Offered 1, 2, 3. An introductory laboratory course dealing with cells, the mammalian anatomy, the major groups of plants, methods of reproduction and germ cell formation. BLY. 162.-Biology Laboratory. 4 hours laboratory. 2 credits. Prerequi- site or corequisite: C-62. Offered 1, 2, 3. An introductory laboratory course dealing with genetics, homology, embryology, evolution, taxonomy and ecology. BLY. 161 and 162 are prerequisites for most of the other courses in this depart- ment. **BLY. 201 (formerly BLY. 215).-Biological Laboratory Technique for Teachers. 2 hours, and 3 hours laboratory. 3 credits. Prerequisite: BLY. 161- 162. Designed to provide prospective instructors at the high school level with a sound background in biology and information regarding methods of preparation of material and sources of supply for the high school course. BLY. 202 (formerly BLY. 220).-Evolution Today. 2 hours. 2 credits. Prerequisite: C-6. Offered 2. Evolutionary theories and their historical development. Available for students in the social sciences and the humanities. BLY. 207.-Vertebrate Natural History. 2 hours, and 6 hours laboratory. 4 credits. Prerequisite: BLY. 161-162. Offered 2. An introduction to the classification and natural history of the vertebrates. BLY. 208.-Invertebrate Zoology. 2 hours, and 6 hours laboratory. 4 credits. Prerequisite: BLY. 161-162. Offered 1. Structure, function, and evolutionary relationship of a selected series of animals without backbones. BLY. 209.-Comparative Vertebrate Anatomy. 2 hours, and 6 hours laboratory. 4 credits. Prerequisite: BLY. 161-162. Offered 1, 3. Lectures on the structure of the various types of chordate animals are accompanied by laboratory work dealing chiefly with amphioxus, shark, salamander, lizard and bird. BLY. 210.-Vertebrate Embryology. 2 hours, and 6 hours laboratory. 4 credits. Prerequisite: BLY. 209. Offered 2. Lectures on the embryology of the various groups of chordate animals are ac- companied by laboratory work dealing chiefly with the frog, chick and pig. BLY. 322.-Readings in the Biological Sciences. 3 hours. 3 credits. Pre- requisite: C-6 and consent of instructor. Offered 1. Readings in selected contributions of biology to human thought and welfare, and their application, both in the sciences and to everyday life. Available for the students in the social sciences and the humanities. BLY. 325.-Genetics and Speciation. 2 hours, and 3 hours laboratory. 3 credits. Prerequisite: BLY. 161-162. Offered 1. An introduction to the data and methods of genetics with special reference to their bearing on the problems of speciation and organic evolution. The statement "Offered 1" means offered first semester; 2, second semester; 3, summer session.