Archive image from page 483 of Cyclopedia of American horticulture, comprising. Cyclopedia of American horticulture, comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches cyclopediaofamer04bail4 Year: 1900 2641. Kinds above of variegation. Sansevieria and Caladium below. plant, and causing the changes known as variegation. Investigations conducted by the writer on the so-called mosaic dis- ease of tobacco, which
Archive image from page 483 of Cyclopedia of American horticulture, comprising. Cyclopedia of American horticulture, comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches cyclopediaofamer04bail4 Year: 1900 2641. Kinds above of variegation. Sansevieria and Caladium below. plant, and causing the changes known as variegation. Investigations conducted by the writer on the so-called mosaic dis- ease of tobacco, which is a form of variegation, and also on many other forms of ordinary variega- tion, show quite conclusively that the disease is not caused by micro- organisms, but is due to a de- ranged condition of the nutrition of the cells. Without going into the details of the matter, it may be said that the condition is charac- terized physiologically by a marked increase in the oxidation processes in the cells, caused by the presence of an abnormal amount, or an ab- normal activity, of oxidizing fer- ment in the protoplasm. This fer- ment prevents the movement of food substances, especially starches and nitrogenous materials. The decrease of the latter is especially marked, and it is probably on ac- count of the lack of sufficient ni- trogenous food that the cells do not develop normally. The young growing buds and dividing cells require highly organized albumi- noid foods. They do not make use, to any extent, during the pro- cess of growth and cell division, of the ordinary nitrates which are built up into nitrogenous foods by the mature cells. The oxidizing ferments, though normal constitu- ents of all cells, prevent, when they become excessively active, the proper nutrition of the dividing cells, and it is a curious fact that when these ferments are extracted from plant tissues and injected into the young buds of healthy tissues, they will, in the case of tobacco at least, cause the bud
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Keywords: 1900, archive, bailey_l_h_liberty_hyde_1858_1954_ed, book, bookauthor, bookdecade, bookpublisher, booksponsor, booksubject, bookyear, boston_library_consortium_member_libraries, drawing, gardening, historical, history, illustration, image, miller_wilhelm_b_1869_joint_author, new_york_etc_the_macmillan_company, page, picture, print, reference, vintage, zimmermann_a_albrecht_b_1860
