Show I CHEMICAL RELATION TO LIFE Our most constant and vital relation rotation to tho the world without Is a chemical ono one Wo We 0 can eRn go JO without food for tor some days das but we can exist without breathing only onh a few moments Through these spongy lun lungs of ours wo we lay hold upon tho the outward world in to the most Intimate te and anti constant wa way Through them we weare weare are arc rooted to the air nir The Tho air Is a mc- mc 1 mixture of ot two to very unlike gases nitrogen gases nitrogen and ox oxygen en ono one very inert tho the other very active o. Nitrogen Is s like 1110 a cold blooded lethargic person It It combines with other substances BU very reluctantly and with but hut little energy Ox Oxygen en Is Just Its opposite In Inthis Inthis this rep respect ct It gives itself freely Itis it IK is Hall f fellow lIo well meta met with most substances and It en enters tors Into n rl with them on such a largo larKo scale that It forms nearly ono half of oC the tho material of the tho earths earth's crust This invisible In in- In Invisible visible gas gns this thU breath of air through tho the magic lc of ot chemical combination forms torms nearly half the the tho sut substance of oC he the tho solid rocks Deprive It t of Its affinity for tor carbon rhon or substitute nitrogen or hydrogen In Its place and amI the air would quickly suffocate us That c changing of the tho dark venous enous blood That In our lungs Into the tho bright red rell arterial blood would I in instantly In- In the sensation of cc so Fancy Inhaling an nn odorless nonpoisonous at- at that would make ono Rep sp i for breach breath Wo should be quickly poisoned by hy tho the waste of our own bodies All things that live lI must have o oxygen and andall andall andall all things that burn hurn must have hayo oxygen Oxygen docs does not burn but hut It supports John Burrou Burroughs hs in Harpor's Har- Har por's pors for or April |