A practical course in botany : with especial reference to its bearings on agriculture, economics, and sanitation . ening apiece of sewing thread with indelible ink andapplying it to the surface of the root at intervalsof about two millimeters (xo of an inch), or bytying a thread lightly around it at the same inter-vals. Lay the seedling on a moist bedding be-tween two panes of glass kept apart by a sliver ofwood to prevent their injuring the root by for a day or two, and .you will see thatgrowth takes place from a point just back of thetip (Figs. 61, 62). Mark off a seedling of
A practical course in botany : with especial reference to its bearings on agriculture, economics, and sanitation . ening apiece of sewing thread with indelible ink andapplying it to the surface of the root at intervalsof about two millimeters (xo of an inch), or bytying a thread lightly around it at the same inter-vals. Lay the seedling on a moist bedding be-tween two panes of glass kept apart by a sliver ofwood to prevent their injuring the root by for a day or two, and .you will see thatgrowth takes place from a point just back of thetip (Figs. 61, 62). Mark off a seedling of the bean in the sameway and watch to see whether it increases in the same maimer as the corn. Experiment 35. How does the stem l\ckease in length? — Markoff a poi-tion of the stem of a bean seedling as cxplaincHl in the last experi-ment, and find out how it grows. Allow a seedling to develop until ithas put forth several leaves and measure daily the spaces between these spaces in your drawings, internodes, and the points where theleaves are attached, nodes. Does an internode stop growing when the. Figs. 61, 62. —Seed-ling of corn, marked toshow region of growth :61, early stage of germi-nation ; 62, later stage. 48 PRACTICAL COURSE IN BOTANY one next above it has formed ? When is growth most rapid ? Reverse theposition of a number of scedhngs that have just begun to sprout and watchwhat will happen. After a few days reverse again and note the effect.
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisher, booksubjectplants
