THE NEW STUDENT'S REFERENCE WORK
6. TREES:
a. Kinds: 693; 1940.
b. Parts:
(1) Leafshedding: 512; maple 530; 1166; oak 1367; apple 85;
ash 117; elm 609; beech 192; tulip 1949; hickory 872; horse-chestnut 887; catalpa 348.
(2) Evergreen: do not shed leaves, cypress 492; pine 1492;
fir 675; hemlock 860.
(1) Roots: 1632.
(2) Trunk:
(a) Bark: 172.
(3) Wood: 1930.
(4) Branches'. 259; 818.
(a) Ascent of water: 2051.
(b) Vascular bundles: 2004.
fl. Differences in bark:
462.
2. Work of bark: 466.
3. Growth of bark: 621.
a. How wood is formed on inside: 1678; cambium 312; blast 179; trees 1940; heart-wood 854.
(a) Heartwood: 854.
(b) Sapwood: 1673.
(c) Rings and layers and their mean-
ing: 1940.
(a) Different positions in various trees: pine 1492; elm 609; hemlock 860.
f (a) Shade trees: oak 1367.
(5) Flowers and fruits of trees: 1367.
(b) Fruit trees: 721.
(c) Forest trees: 693.
'1. Dry: maple 1166. 2. Fleshy: peach 1434; plum 1506; cherry 377; apple 85; pear 1435.
(6) Leaf: 1480; Cyclic; Spiral. 7. AGRICULTURAL PLANTS:
General References: agriculture 26; balanced ration 159; ensilage 619.
a. Forage crops: 651; alfalfa 46; corn 457.
(1) Work: benefit to soil 1353; root tubercles 1633.
b. Grains and grasses: 795; wheat 2072; rye 1650; rice 1610; oats 1638;
pea 1432; millet 1227; alfalfa 46; clover 413; cowpeas 470; buckwheat 283.
(1) Character of roots: nitrogen crops 1352; root 1632; root
pressure 1633; root stock 1633; root tubercles 1633.
(2) Stems: 795; 1821.
(3) Flower: 795.
(4) Difference in grains:
(a) Length of root: 46.
(b) Hardiness: 283; cowpeas 470; rye 1650; oats 1638. C. Root crops: tub«r 1^48; potato 1537.
(1) Difference in character: 1632.
(2) Materials taken from soil: phosphates 1475; potassium 1537;
sulphur 1846; nitrogen 1353; fertilizers 657; manures 1165; rotation of crops 1636.
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