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The Scientific Monthly, Vol. 14 (Classic Reprint): January-June, 1922: January-June, 1922 (Classic Reprint) - Tapa blanda

Cattell, J. McKeen

 
9780243023615: The Scientific Monthly, Vol. 14 (Classic Reprint): January-June, 1922: January-June, 1922 (Classic Reprint)
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ISBN 10: 0243023618 ISBN 13: 9780243023615
Editorial: Forgotten Books, 2018

Sinopsis

Insights into the progress of science from a 1922 vantage point. This issue of The Scientific Monthly collects concise reports, commentaries, and sketches that illuminate how science shaped society in the early 20th century. From the planning and architecture of a new National Academy of Sciences building to the people who advance discovery, the pages offer a snapshot of the era’s curiosity and method.

The magazine presents a mix of news, historical notes, and short features. Readers will encounter updates on major scientific institutions, milestones in research, and portraits of notable scientists. The tone is informative and accessible, aiming to connect laboratory work with public life and policy.


  • An in-depth look at the planned National Academy of Sciences building in Washington, including design, facilities, and the role of science in public life.

  • Profiles and awards highlighting contributions to geology, meteorites, paleontology, and physiology, with context on how these fields evolved.

  • Discussions of education and international exchange, including observations on medical education in Japan and China’s place in the modernization of science.

  • A curio on the history of mathematics, featuring a famous title-page related to the squaring of the circle and its teaching legacy.



Ideal for readers of early 20th‑century science, history of science, and those who enjoy concise, illustrated snapshots of scientific progress and institutional development.

"Sinopsis" puede pertenecer a otra edición de este libro.

Reseña del editor

Excerpt from The Scientific Monthly, Vol. 14: January-June, 1922

The dahlia is one of the most popular garden flowers due largely to its easy culture, simple vegetative propagation and the wealth of colors and forms. The fact that the plants can also be easily grown from seed, giving an astonishing array of markedly different flowers, has made this a fascinating subject for experimentation by the amateur gardener and has greatly increased the number of well recognized va rieties. The dahlia was first. Generally cultivated in Europe in 1789 having been introduced from Mexico. At that time the flowers were single and not greatly different from Cosmos and Coreopsis which are its nearest relatives. The first double flowered form was recorded in 1814 at which time there were listed some 12 well marked color types. Twelve years later the number of varieties had increased to 60 due to recombinations of the existing color varieties with the double flowered condition and also new shades of color were brought out by crossing and doubtless by mutation as well.

About the Publisher

Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com

This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

Reseña del editor

Excerpt from The Scientific Monthly, Vol. 14: January-June, 1922

In addition to these striking differences of color and markings the seeds difler somewhat in size and shape. Whether these are genotypical differences or merely modifications due to the growth of the plant can only be told by further testing. The plants which produced these seeds differed in no less degree. They were yellow or green podded and the pods were flat or round. They were diverse in time of blooming and ripening. They were also unequal in productiveness, hardiness, dis ease resistance, stringiness and toughness of the pods. These are the more important qualities but they are not so surely recognized as the noticeable seed characters.

Natural crossing in this manner has been the most important agency in the multiplication of varieties. Striking variations such as occurred in the beans just described attract the fancy of the gardener. The seeds are saved and sown. The unusual features may or may not persist. Some of them may be an improvement over existing sorts. The seed from the most promising plants is again saved and since beans are largely self fertilized the hybrid combination of characters are quickly reduced in numbers and uniform and constant strains are established in the course of several years, that is, they soon come true to type. The best of these strains are selected and a new variety has been created or rather re-formed. Further testing shows whether the new variety has sufficient merit to be worthy of general cultivation and if it has it soon finds its way into the seed catalogues. Such in brief is an outline of the history of nearly all the commonly cultivated vegetables and flowers.

It is generally thought that selection has brought out these new forms. Such is indeed the case but the variability induced by crossing has made the opportunity for selection to be effective. Those charac ters which really determine the value of a variety, such as hardiness, productiveness, quality, and which are dependent upon all parts of the plant, are so complex in mode of inheritance that it is not at once appar ent that recombination of definitely hereditary factors takes place just as surely as in color and pattern. The changes are usually small in degree and the characters are more easily influenced by the external conditions. For that reason selection is the means of sorting out the best hereditary material and with many plants selection must always be continued to maintain improved varieties at their high level.

About the Publisher

Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com

This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

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Editorial
Forgotten Books
Año de publicación
2018
Idioma
Inglés
ISBN 10 
0243023618
ISBN 13 
9780243023615
Encuadernación
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Número de páginas
596
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