Books Should Be Free is now
Loyal Books
Free Public Domain Audiobooks & eBook Downloads
Search by: Title, Author or Keyword

Effects of Cross and Self Fertilisation in the Vegetable Kingdom   By: (1809-1882)

Book cover

First Page:

THE EFFECTS OF CROSS & SELF FERTILISATION IN THE VEGETABLE KINGDOM.

BY

CHARLES DARWIN, M.A., F.R.S., ETC.

CONTENTS.

CHAPTER I.

INTRODUCTORY REMARKS.

Various means which favour or determine the cross fertilisation of plants. Benefits derived from cross fertilisation. Self fertilisation favourable to the propagation of the species. Brief history of the subject. Object of the experiments, and the manner in which they were tried. Statistical value of the measurements. The experiments carried on during several successive generations. Nature of the relationship of the plants in the later generations. Uniformity of the conditions to which the plants were subjected. Some apparent and some real causes of error. Amount of pollen employed. Arrangement of the work. Importance of the conclusions.

CHAPTER II.

CONVOLVULACEAE.

Ipomoea purpurea, comparison of the height and fertility of the crossed and self fertilised plants during ten successive generations. Greater constitutional vigour of the crossed plants. The effects on the offspring of crossing different flowers on the same plant, instead of crossing distinct individuals. The effects of a cross with a fresh stock. The descendants of the self fertilised plant named Hero. Summary on the growth, vigour, and fertility of the successive crossed and self fertilised generations. Small amount of pollen in the anthers of the self fertilised plants of the later generations, and the sterility of their first produced flowers. Uniform colour of the flowers produced by the self fertilised plants. The advantage from a cross between two distinct plants depends on their differing in constitution.

CHAPTER III.

SCROPHULARIACEAE, GESNERIACEAE, LABIATAE, ETC.

Mimulus luteus; height, vigour, and fertility of the crossed and self fertilised plants of the first four generations. Appearance of a new, tall, and highly self fertile variety. Offspring from a cross between self fertilised plants. Effects of a cross with a fresh stock. Effects of crossing flowers on the same plant. Summary on Mimulus luteus. Digitalis purpurea, superiority of the crossed plants. Effects of crossing flowers on the same plant. Calceolaria. Linaria vulgaris. Verbascum thapsus. Vandellia nummularifolia. Cleistogene flowers. Gesneria pendulina. Salvia coccinea. Origanum vulgare, great increase of the crossed plants by stolons. Thunbergia alata.

CHAPTER IV.

CRUCIFERAE, PAPAVERACEAE, RESEDACEAE, ETC.

Brassica oleracea, crossed and self fertilised plants. Great effect of a cross with a fresh stock on the weight of the offspring. Iberis umbellata. Papaver vagum. Eschscholtzia californica, seedlings from a cross with a fresh stock not more vigorous, but more fertile than the self fertilised seedlings. Reseda lutea and odorata, many individuals sterile with their own pollen. Viola tricolor, wonderful effects of a cross. Adonis aestivalis. Delphinium consolida. Viscaria oculata, crossed plants hardly taller, but more fertile than the self fertilised. Dianthus caryophyllus, crossed and self fertilised plants compared for four generations. Great effects of a cross with a fresh stock. Uniform colour of the flowers on the self fertilised plants. Hibiscus africanus.

CHAPTER V.

GERANIACEAE, LEGUMINOSAE, ONAGRACEAE, ETC.

Pelargonium zonale, a cross between plants propagated by cuttings does no good. Tropaeolum minus. Limnanthes douglasii. Lupinus luteus and pilosus. Phaseolus multiflorus and vulgaris. Lathyrus odoratus, varieties of, never naturally intercross in England. Pisum sativum, varieties of, rarely intercross, but a cross between them highly beneficial. Sarothamnus scoparius, wonderful effects of a cross. Ononis minutissima, cleistogene flowers of. Summary on the Leguminosae. Clarkia elegans. Bartonia aurea. Passiflora gracilis. Apium petroselinum. Scabiosa atropurpurea. Lactuca sativa. Specularia speculum. Lobelia ramosa, advantages of a cross during two generations... Continue reading book >>




eBook Downloads
ePUB eBook
• iBooks for iPhone and iPad
• Nook
• Sony Reader
Kindle eBook
• Mobi file format for Kindle
Read eBook
• Load eBook in browser
Text File eBook
• Computers
• Windows
• Mac

Review this book



Popular Genres
More Genres
Languages
Paid Books