. Lessons with plants. Suggestions for seeing and interpreting some of the common forms of vegetation. 401 505a. This recalls our discussion (Obs. xviii.) of the disguises ofleaves, for we then found that leaflets may be represented by the pupil will study the position of tendrils of the grape, he will findthat they occupy the places of flower-clusters. (Has he not seen abunch of grapes with one or two ten-drils protruding?) Let him determinethe morphology of the tendrils of cu-cumbers and melons. Observe, also,how the garden nasturtium, or tropseo-lum, climbs. 506. The trumpet cre
. Lessons with plants. Suggestions for seeing and interpreting some of the common forms of vegetation. 401 505a. This recalls our discussion (Obs. xviii.) of the disguises ofleaves, for we then found that leaflets may be represented by the pupil will study the position of tendrils of the grape, he will findthat they occupy the places of flower-clusters. (Has he not seen abunch of grapes with one or two ten-drils protruding?) Let him determinethe morphology of the tendrils of cu-cumbers and melons. Observe, also,how the garden nasturtium, or tropseo-lum, climbs. 506. The trumpet creeper,poison ivy, trueor English ivy,and some otherplants, climbby rootswhich attach Ijthemselvesthe support, f^Observe that suchoccupy the darkon the buildingwhich they climb. 507. Many plants are mere scramblers, as sometall forms of blackberries, galiums (Fig. 63), someof the smart-weed tribe or polygonums. Suchplants are often provided with various hooks orprickles by means of which they are secured tothe support as they grow; but it by no meansfollows that all hooks or prickles on plants serve. roots prefer to places or chinks or bark upon AA 402 LSSSOJSrS WITS PLANTS such a purpose, or, in fact, that they were devel-oped primarily as a means of enabling the plantto climb. SuGQKSTiONS.—We have thus seen how some plants are able tomaintain themselves in the fierce struggle for existence. Let thepupil observe if climbing plants naturally grow with other and tallplants, or do they frequent places of less competition and run theirchances of finding support on other things than growing plants. Doesthe climbing habit impress the pupil as being a means ot enabling theplant to reach light and air 1 In respect to the methods by whichplants climb, any climber will afford interesting study, but the teacherwill find young morning-glory, pea, pole bean, Japanese hop, cucum-ber, and nasturtium plants to be easily grown from seeds and usefulin demonstration. Darwins Movements and Habits
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Keywords: ., bookauthorbai, bookcentury1900, bookdecade1900, booksubjectbotany
