270 Education through Nature 



SOILS AND GERMINATION or SEEDS. 



6. Properties of Soils 



1. Sand 



2. Clay 



3. Loam 



4. Moisture 



1 . Carbon compounds 



2. Carbon dioxide 



3. Proteids 



4. Ammonia 



5. Organic substances 



6. Various salts 



7. Conditions for Germination 



1. Resting period of some seeds 



2. Moisture 



3. Heat 



4. Oxygen or air 



8. Effects of Ger- 

 mination 



f ,, r ( i. Seed leai 



Absorption of albumen from j 2> En( i OS p e 



Seed leaves 

 ;rm 



2. Unfolding of embryo 



3. Lengthening of the hypocotyl 



4. 1. brmation of roots 



5. Connection with the soil 



fi. Leaf -buds, stems in miniature 



2. Homology of Buds \ 2. Flower-buds, homologous to leaf-buds, as 

 I the flower is a modified stem 



