WAR- 



348 



WIN- 



warm-blooded, a term appl. animals 

 which have a fairly high and 

 constant temperature which is 

 above that of the surrounding 

 medium. 



warning colours, conspicuous 

 colours assumed by many animals 

 to warn off enemies (biol.}. 



wart (w6rt) n. [A.S. wearte, wart.] 

 A dry excrescence formed on the 

 skin (zool.} a firm glandular pro- 

 tuberance (dot.}. 



water-cells, specialized cells in the 

 stomach of the camel for storage 

 of fluid (zool.}. 



water culture, the experimental 

 growing of plants in water to see 

 the effect of different salts on them 

 (bot.}. 



water - gland, a structure in the 

 mesophyll of leaves regulating 

 water excretion through stomata 

 (bot.}. 



water - pore, the minute ciliated 

 opening through the actinal wall 

 of the disc of Antedon (zool.} ; an 

 opening at the apex of a leaf-vein 

 for the excretion of water (bot.}. 



water stomata, pores on the sur- 

 faces of leaves for the excretion of 

 water (hot.}. 



water - tube, a ciliated branched 

 tube connected with the ring-vessel 

 and coelom (zool.}. 



water vascular system, a system of 

 canals circulating a watery fluid 

 throughout the body of Echino- 

 derms ; also applied to the ex- 

 cretory system of Platyhelminths 

 (zool.}. 



wattle (wot'l) n. [A.S. -watel, bag.] 

 The fleshy process, usually red, 

 under the throat of a cock or 

 turkey (zool.}. 



wax (waks) n. [A.S. iveax^ wax.] A 

 substance produced by bees and 

 used in forming the honeycomb 

 (zool.}. 



wax pocket, a wax-secreting cavity 

 on the abdomen of the bee (zool.}. 



web (w6b) n. [A.S. -webbe, web.] 

 The membrane stretching from toe 

 to toe in swimming Birds; vexillum ; 

 the fine network of threads spun by 

 Spiders (zool.}. 



webbed (w6bd) a. [A.S. webbe, web.] 

 Appl. feet of swimming Birds owing 



to the toes being connected by a 

 membrane (zool.}. 



Weberian apparatus, an apparatus 

 found in Cypriniformes connecting 

 the ear with the air-bladder, first 

 described by Weber (zool.}. 



Weberian ossicles, a chain of four 

 small bones stretching on each side 

 from a membranous fenestra of the 

 atrium to the air-bladder in Cyprini- 

 formes (zool.}. 



wedge bones, small infravertebral 

 ossifications at the junction of two 

 vertebrae, often present in Lizards 

 (zool.}. 



Weismannism (wis'mamzm) n. 

 [ Weismann, German biologist.] 

 The teaching of Weismann in con- 

 nection with evolution and heredity, 

 chiefly dealing with the continuity 

 of the germ-plasm, and the non- 

 transmissibility of acquired char- 

 acteristics. 



wheal (hwel) n. [A.S. hwelian, to 

 inflame.] A long-continued shorten- 

 ing and thickening of a muscle 

 fibre on stimulation (phys.}. 



wheel organ, the locomotory ciliated 

 ring of Rotifers ; the specialized 

 ciliated epithelial structure in the 

 buccal cavity of the Cephalochorda 

 (zool.}. 



white body, the so-called optic 

 gland of Molluscs, a large soft body 

 of unknown function (zool.}. 



white corpuscle, a leucocyte. 



white matter, tracts of medullated 

 fibres in brain and spinal cord (anat.}. 



white yolk spheres, minute vesicles 

 forming a flask-shaped plug in the 

 centre of the egg-yolk, and a layer 

 investing it (cyt.}. 



whorl (hworl) n. [A.S. hiueorfa, a 

 wheel.] The spiral turn of a uni- 

 valve shell (zool.} ; a circle of 

 flowers or parts of a flower arising 

 from one point (bot.}. 



wind-fertilization, the fertilization 

 of plants by pollen carried by the 

 wind (bot.}. 



wing (wing) n. [M.E. ivinge^ wing.] 

 One of two lateral petals in a 

 papilionaceous flower ; the lateral 

 expansion on many seeds (bot.} ; 

 any broad membranous expansion ; 

 the fore-limb of Birds ; the flight 

 organ of Insects (zool.}. 



