412 BIOLOGY 



oviparous animals. Animals that lay eggs, 290. 



ovules. The small bodies in the pistil that contain the macrospores and 

 grow into the seed, 121. 



oxidation. Union with oxygen, as in ordinary combustion, 55, 138. 



palatine bones, 180. 



paleontology (Gr. palaios = ancient + out = being + logos'). The study 

 of the distribution of organisms in the past ages by means of fossils, 

 383. 



palisade cells. A layer of regular, chlorophyll cells, just beneath the upper 

 epidermis in most leaves, 117. 



pallium. See mantle. 



pancreas. A digestive gland opening into the intestine just below the 

 stomach, 187, 204. 



pancreatic fluid or juice. The secretion of the pancreas, 204, 306. 



Pandorina, 73, 90, 263. 



papilla. A small finger-like projection. 



parallel-veined leaves. Those with veins running from base to tip, or 

 from midrib to margin, in a roughly parallel course, 114. 



Paramecium, description of, 59. 



parasite. An organism that lives upon and feeds upon a living host, 227. 



parasitism, effect of, 231. 



parasphenoid bones, 180. 



parenchyma (Gr. para = beside + enchein = to pour in). Short, square- 

 ended cells in plants, 106. 



parietal bones, 180. 



parotids. Salivary glands in front of the ear in some animals. 



parthenogenesis (Gr. parthenos = virgin + genesis = a creation). Re- 

 production by eggs which do not require fertilization, 246, 262, 265. 



PASTEUR, 14. 



PASTEUR'S solution, 83. 



patheticus. The fourth cerebral nerve, supplying the eye muscles, 194. 



pathogenic (Gr. pathos = disease + -genie). Disease producing, 82. 



pectoral. Pertaining to the chest. 



pedal (Gr. pous = a foot). Pertaining to the feet. 



peduncle. The stalk supporting a flower, 118. 



pelagic (Lat. pelagus = the sea). Pertaining to the open ocean. 



pelvis. The girdle of bones attaching the legs to the spinal column, 182. 



Penicillium, 96. 



penis. The male copulatory organ, 291. 



pepsin. A ferment in the gastric juice. 



peptone. A soluble form of proteid. 



peptonize. To convert ordinary proteids into peptones. 



