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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.

2225