| Show Not Notto Does Doe Mere Breathing to 2 Convey Odor to the Nose I Most persons think they smell with their noses but actually only la is small part of the nose reacts to toi i odors declares a writer in the Philadelphia Phil- Phil X L. L t t I adelphia Record The true olfactory tract is the delicate membranous lining of the uppermost part of the nasal cham cham- ber In each nasal chamber this area covers approximately one square inch and from these areas nerve fibers gather together form form- ling the first or olfactory nerve and communicate directly with the Ibrain brain Each of the fibers comes from a sense cell which forms part of the i olfactory organ and each cell Ire reaches aches through this organ to its outer louter or exposed face lace where it terminates ter- ter in six or eight relatively long filaments which are the so- so called olfactory hairs These float I in tin a thin layer of the watery mucus which covers the olfactory surface When you breathe the air passes tin fin and out through the lower part of ot the Ithe the nasal chamber without entering Ithe the region of the olfactory organ at all Naturally this means that in ordinary breathing we are not cognizant cog- cog of odors However when we suspect an odor we automatically sniff which carries the air into the upper part parti i of lof the nasal chamber and brings lit jit into contact with the olfactory i surf surface ace What is known as true smell has to do only with relatively delicate delicate delicate deli deli- cate perfumes and odors and it is transmitted by the first nerve The fifth or nerve which is distributed throughout the whole surface of the nasal chamber is rt Tres tn to irritants t P U Y J Smells actually are conveyed to the nose by minute particles of the substance creating them Just how tiny these are may be judged from the fact that one millionth of ofa a milligram of which smells like garlic contains molecules of the substance itself I |
