CtLOSSARY-lNDEX 421 



streaming of protoplasm. The circulating motion of protoplasm within 

 a cell, 32. 



struggle for existence, 353. 



style. The projection on top of an ovary in a flower, 120. 



subspecies. A subdivision of a species; sometimes called a variety, 371. 



sugar. A carbohydrate with the general formula C 6 Hi 2 O G (monosac- 

 charide) or Ci 2 H 2 2On (disaccharide), 8, 132, 134. 



summer eggs. Eggs produced in the summer which develop at once, 247. 



sundew, 224. 



sunlight, 131. 



supination. Position of the forearm when the palm of the hand is upper- 

 most. 



support, 139. 



supraoccipital bones, 180. 



survival of the fittest. Same as natural selection, 353. 



suspensorium, 180. 



suture. A jagged union between two bones, as in the skull. 



swarm spores. Spores with flagella enabling them to swim; zoospores. 

 74. 



symbiosis (Gr. sun = together + bios = life) . The living together of 

 two organisms in close relations, which may be advantageous or dis- 

 advantageous to each, 228. 



sympathetic system. Two chains of nerve ganglia and nerves lying in the 

 body cavity, parallel to the spinal cord, 195. 



symphysis. A union of two bones in the median line of the body. 



syncytium (Gr. sun = together -f- cytos = cell). A mass of living pro- 

 toplasm with many nuclei but no cell boundaries; acellular, 89, 99. 



synovial glands. Glands which secrete lubricating fluid into joints, 184. 



synthesis (Gr. sun = together + tithenai = to place). The building of a 

 compound out of simpler parts, 234. 



systematic zoology. The study of organisms which gives attention to 

 classification and naming of species. 



systemic circulation. That part of the circulation which includes the 

 vessels that supply all the body except the lungs, 191. 



systole (Gr. systole = contraction). The period of contraction of the heart, 

 188. 



tactile. Pertaining to touch. 



tadpole, 288. 



tarsals, 182. 



taste, 198. 



taxonomy (Gr. taxis = arrangement + nemein = to arrange). The study 

 of the classification of organisms, 19. 



