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wfr FA TRONIZE OUR? A jMrs. C L. Saunders ail of Evanston Mis. Clyde P. Ross, 1321 Chestnui D VER TISERS avenue, isleavg today to visit hei WITII THE PERMANENT BEAUTY 0F PURE WHITE PORCELAIN - ON - STEEL AND WJTH, ITS NEW STANDARD 0F AOYANCED RXPRIGERATION, F R 1 G 1 - D AIR E' 15SOLD TODAY ,WITII A nthebo nev conpounds. which- have beëri formel wftbtu the plant, are - more or It ion regularly grouped fr mixed to- rgother ln a great varlety of ways In teprocess of plant growth. - The elements may. thorefore, be r.- gardel au the raw mateials from which, planti-fools come. .Whiie the absence of any one. of the éléments inay aeriouaiy Impair or wholiy p1Aevent plant growth, there la. a s~ense 1In whlch: some of the soil-derIved élémnents are of much greater Importance to plant growth than others,. Certain elements are more exteflsively -used by certain plants and sooner or later the soli may need special attention ln the way of ln- eteasing the avallabie supply of. a cer- tain élement for a certain type of plant. Other eloments are, used in such amali amounits,- relative to the avoulable sup- ply, that they rareiy need attention. The elements of specilai mportance are: <Nitrogen, Ph1)osphor.us, Potasium and Calcium., Nitrogen occurs ln nature cbiefly ln the foliowing fdrms: ('1) At- mospherie nitrogen, (2) ammonia, (3) ln animai and vegetabie matter, and (4) as nitrate. Phosphorus-The original source of ail phosphorus la the earth's crust. As Im- médiats sources of suppiy for piant-food uses vo bave (1) the soi, (J) the large phosphate deposits and (3) the bones of, animal&. Potassium - Numerous_ expe'rments have shoya that vhen potassum cern- pounds are iackidng, plants sufer Peverely, though they may not actually die. Potassium'forms a larger part of the ash of plants than* any other minorai, elément. On the average, vegetable ash conÉistà of about one-third ziotassium. Potassium la nover found ln nature un- comblned; It aiways exists la com-. pud.Potassium. ln the solil l lue to tepa'rtil solution and decomposittoni ofrocks contatnlng- potassium cern- pounds. .Calcium-This element Is ossontlnal to. the developmelit of most plants. Uts compounds are oommoniy coll lime compounds. It bais Its source la the crUst of the. eaxth, 'w'ere It occurs In a vairety of compounds, especlally the carbonate (limestone). ,North western A lumni, iWiIl Hon or P resident lA banquet o6f NÔrthWestern alumni in honor of Pres. and Mrs., Walter Dill SCOtt wiII be :held May 1. on, occasion ofthe tnhanvrayo Dr. Scott's administration. * Ex-Gov. Frank 0. Lowden of 11iii-> nois, candidate in 1920 for the Re- publican nomiination for ýthc presi- Frchaisman. Many tributes have bé pwu tç the teu-year acemplisbaeits of Presiqient Scott by alunai i*ho vol- comn the opportunity te express their appecatasOf bis voek. He as the first~o lmusc the iuniversa*y to b.-