176 GLOSSARY. 



Homol'ogous stimuli. Stimuli for whose action or influence 



the sense organs are specifically adapted, and which act 



only upon the special nerve termination. 

 Horop'ter (Gr. hot-os, a boundary ; opter, one who sees). A 



method of showing that rays of light which pass into both 



eyes, fall upon identical points of retina ; the eyes being 



fixed in a definite position. 

 Houston, Folds of. Transverse rugae of mucous membrane 



of rectum. 

 Hydrobiliru'bin. A substance obtained by treating bili- 



rubin with sodium amalgam ; is identical with urobilin. 

 Hydrocar'bons (Gr. hudor, water ; carbonas, a carbonate). 



Compounds of carbon and hydrogen. The simplest of 



organic compounds. 

 Hyoi'dean bar. A mass of embryonic cartilage from which 



the following are developed: Part of hyoid bone, styloid 



process and ligament, and incus. 

 Hyperidro'sis (Gr. huper^ beyond; idros, sweat) . Excessive 



secretion of sweat. 

 Kypermetro'pia (Gr. huper^ beyond ; metron^ a measure ; 



ops, the eye). Long sight. That condition in which 



parallel rays of light are focussed behind the retina ; 



due to shortening of eye-ball, or flattening of lens and 



cornea. 

 Hyphomyce'tes (Gr. mukes, a fungus). Microscopic fungi or 



moulds. 



Hypnoti'sm (Gr. hupnos, sleep; ismos, a state). That con- 

 dition in which volition is temporarily absent. Animal 



magnetism. 

 Hypnotic (Gr. hupnos, sleep). A drug which will produce 



sleep ; e.g. morphia, chloral. 



Ilio-tibial band. The thickened portion of fascia lata of thigh, 

 connecting crest of ilium with titfia. 



Inhibition (L. inhibeo, not to have). A checking or con- 

 trolling influence, exercised by a nerve centre over some 

 subordinate organ or process. 



In'ion (Gr. inion, the nape of the neck). The external 

 occipital protuberance. 



I'nogen (Gr. ts t inos (gen.), a fibre; gennao, to produce). 

 The hypothetical explosive material of muscle. 



I'nosit (Gr. is, inos (gen.), a fibre). A peculiar kind of sugar 

 found especially in heart muscle. 



