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acre affected Agricultural amount animals appears average barn better Board body breeds building bushels called carried cattle cause cent City College condition contagious corn cost covered cows crop cultivation disease drainage drained early experience fact fall farm farmers feed feet field four fruit gain germs give given grain grass ground grow growth hill horses important inches increase interest keep kind labor land leaves less live loss manure matter means meeting milk Missouri Mycelium nature organs plants pounds practical present produce profitable protection question reason seed sheep shelter side soil species spring surface taken tile usually vaccine varieties weight winter yield
Page 460 - Contrariwise, there is a no less wide foundation for the generalization that animals, as Cuvier puts it, depend directly or indirectly upon plants for the materials of their bodies ; that is, either they are herbivorous, or they eat other animals which are herbivorous.
Page 469 - Allow me to take this opportunity to tender you my most cordial thanks for having, by your brilliant researches, demonstrated to me the truth of the germ theory of putrefaction, and thus furnished me with the principle upon which alone the antiseptic system can be carried out.
Page 473 - There is not one circumstance known at the present day which justifies the assertion that microscopic organisms come into the world without germs, or without parents, like themselves. Those who maintain the contrary have been the dupes of illusions and of ill-conducted experiments, tainted with errors which they know not how either to perceive or avoid. Spontaneous generation is a chimera.
Page 465 - to the expression vaccination an extension that I hope science will consecrate, as a homage to the merit and immense services rendered to humanity by one of the greatest men of England — Jenner.
Page 457 - ... an inch. Under the highest powers of the microscope at present applicable such specks are hardly discernible. Nevertheless, particles of this size are massive when compared to physical molecules; whence there is no reason to doubt that each, small as it is, may have a molecular structure sufficiently complex to give rise to the phenomena of life.
Page 471 - To exhaust a soil, however, a parasite less vigorous and destructive than the really virulent one may suffice ; and if, after having by means of a feebler organism exhausted the soil without fatal result, the most highly virulent parasite be introduced into the system, it will prove powerless.
Page 473 - So much for the history of the progress of Redi's great doctrine of Biogenesis, which appears to me, with the limitations I have expressed, to be victorious along the whole line at the present day.
Page 461 - The eminent botanist, De Bary, who was not thinking of our problem, tells us, in describing the movements of these " Zoospores," that, as they swim about, " Foreign bodies are carefully avoided, and the whole movement has a deceptive likeness to the voluntary changes of place which are observed in microscopic animals." After swarming about in this way in the moisture on the surface of a leaf or stem (which, film though it may be, is an ocean to such a fish) for half an hour, more or less, the movement...
Page 471 - In a soil lacking, or exhausted of, the necessary mineral constituents, the tree cannot live, the crop cannot grow. Now contagia are living things, which demand certain elements of life just as inexorably as trees, or wheat, or barley ; and it is not difficult to see that a crop of a given parasite may so far use up a constituent existing in small quantities in the body, but essential to the growth of the parasite, as to render the body unfit for the production of a second crop. The soil is exhausted,...
Page 472 - A great scientific theory has never been accepted without opposition. The theory of gravitation, the theory of undulation, the theory of evolution, the dynamical theory of heat — all had to push their way through conflict to victory. And so it has been with the germ theory of communicable diseases.