The American Journal of Microscopy and Popular Science, 1–2. köideHandicraft Publishing Company, 1876 |
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Page 49 - XVIII. The Nature of Light: With a General Account of Physical Optics. By Dr. Eugene Lommel, Professor of Physics in the University of Erlangen.
Page 36 - Into two other smaller apertures in the top of the cupboard are inserted, air-tight, the open ends of two narrow tubes, intended to connect the interior space with the atmosphere. The tubes are bent several times up and down, so as to intercept and retain the particles carried by such feeble currents as changes of temperature might cause to set in between the outer and the inner air.
Page 50 - FIELD, FOREST, AND GARDEN BOTANY. A simple introduction to the Common Plants of the United States, east of the Mississippi, both wild and cultivated. Cloth, 8vo, 386 pages. Price $2.00. SCHOOL AND FIELD BOOK OF BOTANY. Comprising the " Lessons in Botany," and " Field, Forest, and Garden Botany.
Page 37 - At right angles to a luminous beam passing among the particles they discharge perfectly polarized light. The optical deportment of the floating matter of the air proves it to be composed in part of particles of this excessively minute character. When the track of a parallel beam in dusty air is looked at horizontally through a Nicol's prism, in a direction perpendicular to the beam, the longer diagonal of the prism being vertical, a considerable portion of the light from the finer matter is extinguished....
Page 21 - Notes, by FRANK BUCKLAND A Chapter on Antiquities by LORD SELBORNE, and numerous Illustrations by PH DELAMOTTE.
Page 38 - The wood was coated with cement, in which, while hot, a heated "propagating glass" resembling a large bell-jar was imbedded. The air within the jar was pumped out several times, air filtered through a plug of cottonwool being permitted to supply its place. The test-tubes contained infusions of hay, turnip, beef, and mutton — three of each— twelve in all.
Page 39 - November 2, under a bell-jar containing air so carefully filtered that the most searching examination by a concentrated beam failed to reveal a particle of floating matter. At the present time every one of the tubes is thick with mycelium and covered with mould. Here surely we have a case of spontaneous generation. Let us look to its history. After the air has been expelled from a boiling liquid it is difficult to continue the ebullition without
Page 37 - ... to cause these long-dormant infusions to swarm with active life is the access of the floating matter of the air. After having remained for four months as pellucid as distilled water, the opening of the back door of the protecting case, and the consequent admission of the mote-laden air, sufficed in three days to render the infusions putrid and full of life. That such life arises from mechanically suspended particles is thus reduced to ocular demonstration.
Page 42 - On the 12th all the tubes had given way, but the differences in their contents were extraordinary. All of them contained Bacteria, some few, others in swarms. In some tubes they were slow and sickly in their motions, in some apparently dead, while in others they darted about with rampant vigour. These differences are to be referred to differences in the germinal matter, for the same infusion was presented everywhere to the air. Here also we have a picture of what occurs during an epidemic, the difference...
Page 35 - Lister and its experimental verification, regarding the filtering power of the lungs ; from all of which he concluded, six years ago, that the power of developing life by the air, and its power of scattering light, would be found to go hand in hand. He thought the simple expedient of examining by means of a beam of light, while the eye was kept sensitive by darkness, the character of the medium in which their experiments were conducted, could not fail to be useful to workers in this field. But the...