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The Origin Of Adventitious Roots In Coleus, Ethel Belk
The Origin Of Adventitious Roots In Coleus, Ethel Belk
Electronic Theses and Dissertations
It has long been known that adventitious roots develop from shoots and that adventitious shoots develop from roots. This fact is an important one to the horticulturist in propagating plants by stem or, root cuttings. The point of origin of these structures has not been fully presented. There have been various assumptions mad e as to where and how the adventitious structures arise. To avoid confusion, it is best to indicate that adventitious structures are those which are added to the plant; they are not the normal structures of the plant but are superfluous. They are not, however, superfluous for …
Reversal Of Polarity In Some Woody Dicotyledonous Angiosperms, Ida J. Rude
Reversal Of Polarity In Some Woody Dicotyledonous Angiosperms, Ida J. Rude
Electronic Theses and Dissertations
There has for some time existed a theory regarding organized or possibly unorganized formative substances which flow in different directions in the plant tissue and give to the supposedly polarized meristematic tissues of the plant the power to develop to maintain roots from one given or predetermined extremity and shoots from the opposite extremity only. According to theory – in case of the reversal of the position of these ends in relation to moisture, a corresponding reversal in type of plant organ produced will not ensue and persist. The experiment under discussion in this paper was carried out in an …
The Kentucky-Tennessee Boundary Line., Charles Hugh Hardesty 1894-1955
The Kentucky-Tennessee Boundary Line., Charles Hugh Hardesty 1894-1955
Electronic Theses and Dissertations
This dissertation is arranged in three parts. First is a bibliography of the material used in the study with a roster of the officials of each state that may have jurisdiction over any thing pertaining to the boundary line. Second is an account of the various efforts made by each of the states concerned to establish and confirm the line. Chapter one relates the efforts of the English Government to establish the line between Virginia and North Carolina. Chapter two is an account of the two states to establish the line, from the time they declared themselves free of English …
The Preparation Of Hydroxy-Acridines And Different 5-Position Acridine Derivatives., Francis Bratten Rethwisch
The Preparation Of Hydroxy-Acridines And Different 5-Position Acridine Derivatives., Francis Bratten Rethwisch
Electronic Theses and Dissertations
Jensen and Friedrich have outlined new methods for the preparation of acridine compounds. They have shown that the treatment of o-aminobensaldehyde with the halogen derivatives of nitrobenzene and with the corresponding derivatives of toluene would yield the corresponding diphenylamine derivatives. These diphenylamine derivatives split off water very easily to form acridine compounds. By this method they have prepared the 1(9)-nitro and 3(7)-nitroacridine, and the 1(9)-methyl and 3(7)-methylacridine. The general application of the reaction used in preparing these compounds has been examined, and it has been found that the reaction can be extended in two ways. Halogen derivatives of benzene compounds, …
Postal Communication In The South-West, 1789-1813., Mary Angela Sweeney
Postal Communication In The South-West, 1789-1813., Mary Angela Sweeney
Electronic Theses and Dissertations
In every civilization of which any record has been preserved, there is known to have been some organized plan for maintaining communication by couriers who were either post runners or riders mounted. The relaying of these couriers was an obvious expedient for securing greater speed. The term post is derived from positus of the verb pono. The place where the relay was effected was marked by a "post." Hence post road, post office. The colonists brought to America no ideas of postal service from England. The General Post Office of Great Britain was no t established until 1657 and the …
Color., Bruce B. Vance
Color., Bruce B. Vance
Electronic Theses and Dissertations
Color, any attempt to apply the scientific principles of color vision in the making of a picture must surely fail if it be not granted at the out set that it is only to a limited degree that those principles can apply. Color appreciation is as much a psychical as a physiological, and indeed, it is psychical not only with regard to the objective impression itself, but also with regard to the subjective, the associational mental process. Previous knowledge and training, experience traditions, the association of color impressions with impressions previously received through other senses and stored away as memories, …