OCR Text |
Show in uonor 01 inu uirmuuy aiiiiivoiaiir of hor son Keith. A numbor of llttlo friends enjoyed tho occasion. o PLANTS NEED COLD WEATHER Experiments Have Shown That In Northern Countries a Certain Amount la Essential. According to common belief, cold weather causes plants to become dormant dor-mant during the fall, wlillo warm weather the succeeding spring ngaln incites now growth. Intenslvo Investigations Inves-tigations of Dr. Frederick V. Covlllo of tho federal Department of Agriculture, Agricul-ture, which have been conducted over a period of ten years, and which lmvo covered every phaso of this subject, demonstrate that both of these traditional tra-ditional theories are erroneous. Dormancy Dor-mancy In our nntlvo trees nnd shrubs begins soino time beforo the start of cold weather each winter; tho nppenr-nnce nppenr-nnce of Jack Frost Is not necessary for the establishment of complcto dormancy. dor-mancy. Furthermore, after such a condition of dormancy has dcvolopod, oxposuro of tho plants to tho ordinary growing tempcraturo thereafter does not arouso them from their lethargy so that they begin growth nnow, Interestingly enough, tho Oovllle experiments ex-periments show that plants which lmvo, responded to tho lure of nu-turanal nu-turanal and wlntor dormancy will not react properly nnd resumo normal growth tho following spring unless thoy nro aubjected during tho Interim to n period of chilling. A certain amount of cold Is essential to stimulating stimu-lating tho plant growth. Scientific American. |