Department Bulletin, Temas1126-1150The Department, 1924 |
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Otras ediciones - Ver todas
Términos y frases comunes
25 per cent Acala anthers anthesis antineuritic value applied Argillaceous limestone average bale Biotite Biotite granite borax borax per acre bulb bulletin circulation coils color compression corolla cross-pollination diabase discoloration Dolomite Douglas fir dried drying EFFECT OF BORAX Egyptian experiments F F F F PD Feldspathic Feldspathic sandstone fertilizer foot freezing points fruit germination gneiss grain Granite grown growth heartwood heating Hornblende hybrids inches incipient decay injury insects kernels kiln limestone liver mean number millimeters moisture content muscle number of seeds percentage piling Pima cotton Pima flowers plants plat pollen Polyneuritis potatoes pounds of borax pounds per acre produced Quartzite rice road-building rock Sacaton sandstone sapwood schedules schist slag softwoods soil species steam stigmas surface Table temperature tests tion trees U. S. Dept upland cotton upland pollen usually valve variety wheat wood yarn yield
Pasajes populares
Página 41 - ... the requirements. Like several other steps in. the process it is largely a matter of experience, though there are certain general features which are capable of being reduced to words. The fruit should be so dry that when a handful of slices is pressed together firmly into a ball the slices will be " springy " enough to separate at once upon being released from the hand. In this condition there will be no fruit, or only an occasional piece, that has any visible moisture on the surface. In a slice...
Página 12 - WB GREELEY, Chief. Bureau of Chemistry CA BROWNE, Chief. Bureau of Soils MILTON WHITNEY, Chief. Bureau of Entomology LO HOWARD, Chief. Bureau of Biological Survey EW NELSON, Chief. Bureau of Public Roads THOMAS H. MACDONALD, Chief.
Página 46 - HUMPHREY, CJ 1917. TIMBER STORAGE CONDITIONS IN THE EASTERN AND SOUTHERN STATES WITH REFERENCE TO DECAY PROBLEMS.
Página 57 - The only injury proceeding from inbreeding comes from the inheritance received. The constitution of the individuals resulting from a 'process of inbreeding depends upon the chance allotment of characters preexisting in the stock before inbreeding was commenced. If undesirable characters are shown after inbreeding, it is only because they already existed in the stock and were able to persist for generations under the protection of more favorable characters which dominated them and kept them from sight.
Página 42 - Universal testing machine at a speed of 0.1 inch per minute. A small 2-inch spherical bearing block is placed between the moving head of the machine and the specimen. The average of at least two determinations is reported as the crushing strength, calculated in pounds per square inch. Crushing strength tests are made only when specifically requested.
Página 12 - There is a definite balance between the humidity in the air and the moisture content of wood. All kinds of woo'd, if held long enough in an atmosphere of constant temperature and humidity, will come to the same moisture content. The time required for this adjustment varies with different species.
Página 18 - ... make the air heavier, since the gain in weight brought about by the cooling outweighs the weight loss caused by the increase in humidity. The humidity of the surrounding air not only determines largely the rate at which materials will dry, but it also determines the extent to which they can be dried. The relation between humidity in the air and moisture in the wood is an important one, since it is closely related to all drying schedules and, further, determines the extent to which wood for use...
Página 32 - On the other hand, a permanent diminution in solar radiation would tend to diminish the agitation of the air, and, although the terrestrial temperature would decline, this loss of temperature would not be so great as that which would have occurred if the winds had maintained their previous force. The atmosphere, accordingly, acts as a check upon extreme variations of heat and cold ; when little heat is received, it will be better economized than when the supply of heat is excessive, although particular...
Página 34 - The most common decay found in the heartwood of living coniferous trees is a white pocket rot readily recognized in its typical stage by the fact that the heartwood is honeycombed with small white pockets in which the wood is reduced to a soft fibrous mass, the pockets being separated by firm and apparently sound wood. Figure 2-17 shows typical decay of this character.