GLOSSARY-INDEX 389 



anterior root. The anterior branch of a spinal nerve, carrying impulses 



from the center, 194. 

 anther (Gr. anthos = a flower). The sac on the end of a stamen bearing 



pollen, 119. 

 antheridia (Gr. antheros = flowery). The organs in certain plants that 



produce the sperms, 271. 



anthropoid (Gr. anthropos = man). Resembling man. 

 anus. The posterior opening of the digestive tract; the vent, 157. 

 aorta. The large main artery which carries blood to the lower part of the 



body, 188. 



aperture. An opening, 

 apetalous (Gr. a = without + petalon = a leaf). Flowers without petals, 



119. 



appendages. Elongated projections from organisms, with special func- 

 tions; like legs, tentacles, etc., 175. 

 appendix vermiformis. A small, blind sac attached to the end of the large 



intestines. 

 APPERT, 14. 

 aqueous humor. The transparent liquid between the cornea and the lens 



of the eye, 197. 

 arachnoid membrane. The membrane covering the brain, between the 



dura mater and the pia mater. 

 arborizations (Lat. arbor = a tree). The fine branches in which many 



nerve fibers sometimes terminate, chiefly at their central ends, 



170. 

 archegonia (Gr. arche = first + gonos = race). The organs in certain 



plants that produce small eggs, 271. 



arteries. Blood vessels carrying blood from the heart, 190. 

 articular (Lat. articulus = a joint). Pertaining to the joints, 177. 

 ascent of sap. The flow of liquids from the roots to the leaves, 126. 

 Ascomycetes, 99. 



ascospores. Spores produced in asci, 79, 99. 

 ascus (Lat. ascos = a sac). A sac holding a definite number of spores, 



79, 99. 



asexual reproduction, 238, 243, 262; distribution of, 265. 

 asexual stage (Gr. a = without + sexual). The stage in a metamorphosis 



in which reproduction is by an asexual method. 

 Aspergillus, 97, 102. 



asphyxia (Gr. a = without + sphyzein = to throb). Suffocation, 

 assimilation (Lat. assimulare = to make like). The power of converting 



nourishment into the substance of the body, possessed by all living 



things, 44, 62. 

 astragalus, 182. 



