Show THE TilE SUA SUN SU A ASS AS YOUR DOCTOR Clear Quartz Windows Windo s Pro Pro- Promise Pro Promise mise to o Cur Diseases s 's Caus Caus- Caused Caused ed h by by LacK of Ultraviolet Ultra Hn Rays s in Filtered Sunlight ht Announcement recently that a way has been found t t l produce clear fused quartz quantities glass in commercial ties at a reasonable cost followed hy by byword word that Johns Hopkins hospital had window installed the worl worl's worlds world's s 's first quartz win win- win dow disclosed a ew pew mew chapter in the use of natural a agencies to fight dis- dis disease dis disease lis- lis ease case 1 The of clear c ear fused quartz lies in the fact that it affords s read ready v passage to the ultraviolet rays which glass turns back It is the absence of children ultraviolet ray that causes chil- chil chil dren ept indoors in wintry climates to develop rickets nd other diseases Besides the seven dolors olor s of the rum red 1 red orange yellow green blue indigo and violet violet contains another color which is not visible to the eye and which lies Hes beyond the violet range of th the spectrum This is known as ultraviolet let Not only are arc the arc the eyes insensible fo its presence but the pigment in thoi tho skin is ordinarily proof against it it When the portions of the skin are arc ex- ex exposed exposed ex exposed posed to the ultraviolet ultra ultraviolet rays sunburn develops lathe Inthe In the e extremely rare cases known to science science where people have been born without any in inthe inthe inthe the skin it has been been necessary to keep them out of tile the sun to save their lives Ii Ordinary window v glass is opa- opa opaque opaque opa opaque que to ultraviolet rays and now science has dis covered that to thi this fact rickets a disease of unde elop undeveloped ed cd bones in children is due The discovery was vas made by Dr William T professor of bi bio bio- biophysics bio biophysics physics at Harvard university with the operation co-operation pf bf f President C C Little of or the University of Maine laine They used chickens for the expel experiment experiment ment and produced cd ultraviolet ra rays s 's with an ordinary ordinary mercur mercury lamp using us- us using us using ing a quartz gl be Two chickens were raised in rt t greenhouse under the same conditions condit ons with identical food the same lust bath and the size size same pens The Tho common glas glass 1 of the greenhouse kept out the ultra- ultra violet rays One chicken was ex- ex exposed ex exposed posed to the ray ra raw f of the mercury lamp for fifteen minutes each day It developed much much faster than its un un- un unexposed exposed un-exposed exposed mate and ana at the end of the experiment X-ra X X ray showed the bigger chicken had we developed well developed 1 bones with plenty of or c calcium and anti phosphorus phosphorus phosphorus salts in them while the thc small chicken had poor bone bone one structure and died shortly after the pictures were taken The chick chicken n exposed to the rays for fifteen h minutes allay a day also development and weigh weigh- weighed weighed weighed ed more than chi chickens kens of the same brood which had been been permitted to torun torun torun run at t large under natural sunlight That fact has rai raised raiSed ed the interesting question of whether r longer exposure to the rays might cause the bones to develop elop too fast and nd hence produce a dwarf chicken Scientists believe the experiment indicates indicates that the pre pre- prevalence prevalence pre prevalence valence of pigmy faces aces aces in the tropics with their development to maturity I taking place muck earlier in life than thanin thanin thanin in more temperate climates ma mar may r be du eto an excess of ultraviolet rays from the intense tropical It its application to Humans shumans as planned at Johns Hopkins hospital the new quartz glass is e expected to open a new newfield newfield newfield field of the the treatments The formation off o 0 the bones which is 3 by the r rays s involves a series series of chemical changes es which physiologists physiologists physiologists call calcium metabolism Be- Be Besides Be Besides sides rickets there are arc other diseases caused by the ob ence of calcium such as osis or r l hardening of the eardrum and o 0 a chonic progressive adul disease marked by of A bowlegged child is a victim f rickets The disease cords of every city Dr Bovie Dovie said in ii jl announcing his dis- dis discovery discovery dis discovery covery show that from seven ninety ninety to one hundred per cent of all the babies raised hundred in he northern countries where it is ne necessary essary to keep chil chil- children chil- chil children children dren in-doors in atilt anil to use window glass to shut out the cold have rickets when examined in the spring Undoubted Undoubted- Undoubtedly ly many other physiological processes are involved We Ve may expect to find the same factors influencing the growth g rate of children as have been found in this experiment with the chickens The results of the experiments experiments experiments ments arc are of good economic value be- be be bacue it is a common experience of chicken growers that the death rate of chickens at the age of four and five weeks is very high The experiments show that this death eath rate can bere be re- re reduced reduced re reduced b by supplying ultraviolet light to the chickens Chick Chickens is ns receiving receiving- this treatment arc not only larger but arc are livelier and more vigorous in every way than are those which did not receive it The rho sex characters did not develop in the chickens which were were deprived of the ultraviolet light These characters were fully if not excessively develop developed ed cd in the chickens which did receive the ultraviolet ra radiation I I |