69 



GERMINATION OF SEEDS. 



I. Function of Life to Reproduce Itself. 



II. Environment and Activity of a Plant Directed Toward Produ- 

 cing Seed. 



, A SEED. 



I. Outer parts: hilum or scar-point of attachment; micropyle 

 opening near hilum. ! Seed-coats; outer testa; inner tegmen. 

 II. Timer parts: cotyledons thickened leaves in which nourish- 

 ment is stored, (a) Dicotyledons two. (b) Monocotyledons 

 one. 



Plumule small terminal bud; caulicle or radicle small 



stem within seed-coats. 

 Embryo plantlet. 



Seed, I. Dicotyledon. II. Monocotyledon. 



Venation, Netted. Parallel. 



Wood, Ringed. Fibrous. 



Flower, Fives. Threes. 



I. II. 



Bean. Corn. 



Pea. Wheat. 



III. Plant Seeds under Different Conditions. 



(1) Light, shade, dark. 



(2) Sand, clay, gravel, loam. 



(3) Dry, moist, damp. 



(4) Hot, warm, cold. 



IV. Development of Plantlet. 



(1) Bursting of seed-coats. 



(2) Plumule into stem. 



(3) Radicle into root. 



(4) Cotyledons that are leaf-like. 



(5) Cotyledons not leaf-like. 



(6) Those that grow above ground. 



(7) Those that do not grow above ground. 



NOTE. Record accurately the date of planting, first appearance of plant, 

 first leaves, second leaves, etc. Press and mount plants showing development 

 during two or three days. 



