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muiÇà I 1~ I Luimber ofQuailty Whatever your -lumber needs may be, we can suppiy them. Cail Us for Prompt Delivery 'Trellises, Soreens and Combination Doors tbroiigb, we cannot get. anYtiing Ou t of it- but sulphur; pure suiphur con- tains nothing but suiphur. -Similarly, nitrogen is an element because nô one bas ever bee able to show it contains more than one thing, nitrogen. -Other xaples of elements:are oxyen, çar- bophosphorus, iron,' cilcium etc. * ose of the Ïqmet, scoàmoly known to us, are gases, sucb, as hydro- gen and nitrogen, but most 'of tbem under ordinary circumstances are solids. Mithough thére are thousands of * different kinds of plants growing. on this earth,. nevertheless, With ail their variation of stem, f oliage, flower and frithé.y are nmade up ,f rom> compara- tively .f ew elements. 0f the niftety- * four elements known,. the followping fourteen are -commonl found. in Plants: Calcium, chiorine, hvdrogen*. *iron, magnesium, manganese, nitroge.n, o.tgen, phosphorfis, potassium, silicon, soditm ad1suiphur. rhese elements* occUri very une quai .amounts i the vegetable world. For example, carbots * h3'drogen ami oxygen alone make up over niMty-five per cent, on the aver- age of ail plants. * Neither are these elements of equal importance to plant if e. It has not been. satisfactorily demonstràted that chlorine manganese, silicon and so-î dium oerform anv necessary f unctionj uncer .j; .inr, ni v ns There are .other elements,' in no way essential to plant life that oc- cur under special conditions more ~!DEORATINO .straying into a plant witflout purpose. or plan simply becatise they happen to be, in solutfin in the neighborhood of 'gr6vnng plant-roots' and ,go, iùto the:plant in.éompany with the plant- food proper. The elements requfred, by plants are divided'into two qjuite> distinct classes. wehich show rather marked differences These. two classes are air-derivedl ele- mente and silderived or, minerai oie- moents. The air-derived element8* are: Carboni, Hydrogen,- Nitrogen àudOxv- gen. The soll-derived elements are: Calclim, Trou, Magnesium, Phosphôrus, Potasium Suiphur.,(Chiorine, -Mangan- ese, Bub11on,, Sodium). These two claqse!q differ about as follows:> The air-derived lements corne excluslvely froni the-air (this rnay be directly, *or It may be lu-ý directly, through the rnediumý of the enl.The soII-derIved elements corne directly and exclusiveiy troni the Roi]. When a plant la burned, the alr-derlved ,lements dissppeàr, for the most part. th the form of gases; the soil-derIved or minerai elerpents, usually much the iaflest pai'rt. are ieft In the form of 'nburned residue. or ash, 'upon wbich further heattng ha" no effect. This dis- tinction Is not perfectly sharp, sine Some oxygen ls always found In ash, while a smaîl amount of chlorine, pho«i- nhorus and suiphur may be driven off ti~ the fort» of gases during the opera- tion of burning. Air-derived elements make Up more than 95 per cent of the whole vegetable kingdom, while the soli- cierived elements occur Inu smail amn- ounts. 'varying In different plants snd lu different parts of the samie plant' from a fraction of one per cent to 10- Per cent. or' even In some cass. tainir n-.s a mos, iportatLa~ppicatIfionl en- abling us; to Influence the growth of Planta. W. cannot, te afly appreclable, extent, directly control, at least econom- Icaily, most of the air-derived eieinents in the feeding of plants, but- we cafi do so Indirectly through t he soil-derived elements. In other *ordo. by control.- ing under certain conditions, the five per cent or less of the elements that enterAttuthe, composition of -plants. w e can, fl a large measure,' control, the thé other 95 per cent. The chemical elernents do not coin- ri A" Vss W i, ,For More Than Forty, Ym<rau IVAN LINUD, Awning Company 725 Main St, Wilmutte Phone WIL. 3376 j