GLOSSARY-INDEX 401 



foetus. The embryo while within the uterus of the mother, 291. 



follicle. The pocket in which a hair is produced. 



foods of plants, 126. 



food vacuoles. Clear spaces in Protozoa representing the remains of 



digested food, 

 foramen magnum (Lat. foramen = opening + magnum = great). The 



opening into the skull through which the spinal cord enters, 180. 

 forebrain. The front part of the brain, consisting of cerebrum and thala- 



mencephalon, 193. 



fore-gut. The front part of the alimentary canal; the stomodceum. 

 fossils. The remains of animals or plants found in the rocks, 383. 

 fourth ventricle, 193. 

 free-living, 227. 



frond, The leaf of a fern, 269. 

 frontal bone, 180. 

 fundamental cells. The cells which make up the bulk of the stem of 



young plants; they are roughly spherical in shape and never elongated, 



104. 



Fungi, significance in nature, 134, 234. 

 fusion nucleus. The nucleus formed from the fusion of two nuclei into 



one, as in fertilization or conjugation, 65, 241, 257. 

 gall bladder. The sac which temporarily stores the bile, 187. 

 gamete (Gr. gamete = husband or wife) . One of the uniting cells in sex 



union; usually male or female, but sometimes not showing any sex 



differentiation, 262, 267. 

 gametophyte (Gr. gamete = husband or wife + phyton = plant). The 



stage in the life cycle of a plant that produces sex organs, 272, 275. 

 ganglion. A group of aggregated neuron bodies, 162. 

 gastric glands, 204. 

 gastric juice. -The digestive secretion produced in the walls of the stomach, 



204. 



gastrovascular cavity. The cavity in the body of Coelenterata, 141. 

 gastrula (Gr. gaster = a stomach). An early stage in the embryology of 



animals. See page 285. 



gemmae Special buds formed for reproduction, gemmules, 243. 

 gemmation. The same as budding, 239. 

 gemmules. Special buds which break away from the parent and become 



new individuals; same as gemmae, 

 generation. The whole life history of an organism, from any stage to the 



same stage again, 67. 



genital (Lat. genere = to produce). -Pertaining to reproduction, 

 genus (pi. genera). A grouo of similar species, 371. 



