CONTENTS. IX 



CHAPTEK IX. 



CULTIVATED PLANTS : CEKEAL AND CULINARY PLANTS. 

 PRELIMINARY REMARKS on the number and parentage op 



CULTIVATED PLANTS — FIRST STEPS IN CULTIVATION — GEOGRAPHICAL 

 DISTRIBUTION OF CULTIVATED PLANTS. 



CEEEAL1A. — doubts on the number of species. wheat: 



VARIETIES OF — INDIVIDUAL VARIABILITY CHANGED HABITS 



SELECTION — ANCIENT HISTORY OF THE VARIETIES. MAIZE : GREAT 



VARIATION OF — DIRECT ACTION OF CLIMATE ON. 



CULINARY PLANTS. — cabbages : varieties of, in foliage and 



STEMS, BUT NOT IN OTHER PARTS — PARENTAGE OF — OTHER SPECIES 



OF BRASSICA. PEAS: AMOUNT OF DIFFERENCE IN THE SEVERAL 



KINDS, CHIEFLY IN THE PODS AND SEED — SOME VARIETIES CON- 

 STANT, SOME HIGHLY VARIABLE — DO NOT INTERCROSS. BEANS. 



POTATOES .* NUMEROUS VARIETIES OF — DIFFER LITTLE EXCEPT 



IN THE TUBERS — CHARACTERS INHERITED .. .. Pages 322-351 



CHAPTER X. 



plants continued — fruits — ornamental trees — 



FLOWERS. 



FRUITS — GRAPES — VARY IN ODD AND TRIFLING PARTICULARS. 



MULBERRY — THE ORANGE GROUP — SINGULAR RESULTS FROM CROSS- 

 ING. PEACH AND NECTARINE BUD- VARIATION — ANALOGOUS 



VARIATION — RELATION TO THE ALMOND. APRICOT. PLUMS — 



VARIATION IN THEIR STONES. CHERRIES — SINGULAR VARIETIES 



OF. APPLE. PEAR. STRAWBERRY — INTERBLENDING OF THE 



ORIGINAL FORMS. GOOSEBERRY — STEADY INCREASE IN SIZE OF 



THE FRUIT — VARIETIES OF. WALNUT. NUT. CUCURBITA- 



CEOUS PLANTS — WONDERFUL VARIATION OF. 



ORNAMENTAL TREES — their variation in degree and kind 



— ASH-TREE — SCOTCH-FIR — HAWTHORN. 

 FLOWERS — MULTIPLE ORIGIN OF MANY KINDS — VARIATION IN CON- 

 STITUTIONAL PECULIARITIES KIND OF VARIATION. ROSES 



SEVERAL SPECIES CULTIVATED. PANSY. DAHLIA. HYA- 

 CINTH — HISTORY AND VARIATION OF 352-396 



