GLOSSARY-INDEX 



In this index all defined words are printed in black-faced type; words to which only 

 page reference is given are in roman type. In addition to the words used in the text, 

 definitions are given for some of the more common biological terms. These may be recog- 

 nized by their lack of page references. 



abdomen. The ventral part of the body below the ribs, 175. 



abdominal vein. A vein in the frog, passing over the abdominal wall in 

 the middle line, 191. 



abducens (Lat. ab = from + ducere = to lead). A cerebral nerve supplying 

 the eye muscles, 194. 



abiogenesis (Gr. a = without + bios = life + genesis = birth) . See spon- 

 taneous generation. 



aboral (Lat. ab = away from + os = mouth) . Opposite to or away from 

 the mouth. 



absorption of food, 205, 306. 



accretion. Growth by addition of layers on the outside, 4. 



accompanying cells, 106. 



acellular. See syncytium. 



acetabulum, 182. 



achromatin (Gr. a = without + chroma = color). The part of a cell that 

 does not absorb coloring matter, 33. 



acquired characters. Characters first developed in the body rather than 

 in the germ plasm, 327; inheritance of, 333, 334, 355. 



activity, 2, 3. 



adaptation, meaning of, 342; origin of, 344, 354. 



adipose (Lat. adeps = fat). Fatty tissue. 



adnate (Lat. adnatus = grown to). United to. 



adrenals. Ductless glands lying on the kidneys. 



aerial (Gr. aer = ah*). Pertaining to the ah*. 



aerial hyphae. Branches of a mycelium growing upward into the air and 

 developing spores, 98. 



aerobic. Growing only in the presence of oxygen. 



afferent fibers (Lat. ad = to +ferre = to bear). Fibers carrying im- 

 pulses toward the brain, 172, 212. 



albumen. A proteid, illustrated by the white of an egg, 8, 22. 



alcohol, 79. 



alimentary canal. The digestive tract, 157, 185. 



alimentation (Lat. alimentum = food). The process of food-getting, 138. 



alveolus. Expanded sacs at the ends of ducts, as in the glands or lungs. 

 See page 312. 



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