The morning journal-courier., 1908-12-02

time we swallow food If it did not every particle of food would choke ua. Now this valve works with more au- tomatio precision than any ever placed on an engine,
 We give no conscious effort to It's operatloa and Indeed if VIC did It would not make much difference. Wo could not close or open it consciously If wo tried, but so well is the human mechan- ism adjusted that the valve performs its work without any notice from the brain,
 Nature also discovered and Invented the modern spirit level. This impor- tant invention is as essential to modern engineering and mechanics as the plumbliue. We use natures spirit level to retain our balance
 This device consists of semI-circular canals or channels hollowed out in con necton with the ear and bones of the head and filled with fluid lymph, This fluid flows back and forth in these channels and by so doing informs the brain of the position of the body,
 If we move the head on one side the fluid flows that way and notifies us that we arc far beyond the perpendc- ular. If it were not for this remarkable spirit level we would never know until we had fallen that tho body was tilted to a dangerous angle or that We were losing our balance. Like tho other in ] ig, precision and without conscious effort,
 The spinal column, or backbone, Ia the most ingenious engineering struc~ ture ever built, It contains within its center the spinal cord, injury to which would produce In us immediate paraly- | sls or death, The separate bones Of the spinal column are fitted and ad- lusted so nicely that there is no danger of this, and besides being provided With cushions it is elastic and strong. An engineer could not do better than to study this remarkable invention for pointers In bridge and house building. It is the acme of scientific construo, | tion.
 We get a most remarkable chemical factory along with our mechanical i'm ! ventlons and devices, and every man and woman, no matter how poor, can boast of a chemical department su- perior to anything invented by man. For Instance, tha liver is veritabie | chemical laboratory of itself,
 All the food except the fat must pass 1 through the liver, and there chemical agents are stationed all along tho route to inspect and examine everything we put into our stomachs All dangerous substances arc removed, except when we eat poIsons in such quantities that these agents are overwhelmed
 Also In the stomach there arc chemi- cal agents standing ready to protect us from danger, There arc little machines which manufacture small quantities of hydrochlorlc acid from the salt which we eat This acid destroys the in- iutlous microbes which we swallow by the thousands with our food. Tho acid is a virulent poison and if the machines worked overtime they would make enough to destroy us
 But so automatically and accurately do natures inventions work that there is never an excess of this poison Psychologists have determined that tho machines manufacture dydrochlorlc acid to the extent of orc-ffth of 1 per cent of the contents of the stomach, and this is just the amount required to kill these microbes under ordinary con, ditlons.
 Nature is also a mechanic and car penter of the most skilled efficiency Let a man break a bone and nature immediately begins tb splice iJ Tho surgeon can only put the bono back in 1 plae and then depend upon the master mechanic to finish the job
 | Tho ends Of the bone arc surrounded by terrule of cartilage and then a layer of bone is placed between the cartilage and broken part and the two soldered together When completed the scaffoldlng of cartilage Is removed,