It has been suggested that this change is due to the removal of the colloidal silica in solution, leaving behind the fibres and grains of more crystalline structure.
Long, the grains thinner and longer than in the two-rowed race, and the awns stiff and firmly adhering to the flowering glume.
In the former case it contains numerous grains of sand which are introduced by the animal itself after each moult and which are supposed to act as otoliths.
In the connexion between the first and the second box the gas is found to contain 500 grains of sulphuretted hydrogen and 80 grains of carbon disulphide per Ioo cub.
The lapis Albanus is a green grey volcanic stone with black and white grains in it (hence the modern name, peperino), much used for building material.
Response to the action of gravity appears to be associated with the movements of starch grains in certain cellsstatolith cellsby which pressure is exerted on the cytoplasm and a stimulus set up which results in the geotropic response.
Recent limestones are being produced in this way and also in some places by the precipitation of calcium carbonate by sodium or ammonium carbonate which has been carried into the sea or formed by organisms. The precipitated carbonate may agglomerate on mineral or organic grains which serve as nuclei, or it may form a sheet of hard deposit on the bottom as occurs in the Red Sea, off Florida, and round many coral islands in the Pacific. Only the sand and the finest-grained sediments of the shore zone are carried outwards over the continental shelf by the tides or by the reaction-currents along the bottom set up by on-shore winds.
Central Europe appears to be the locality where it was cultivated, earliest, at least in Europe, for grains have been found among 1 Rarer Kinds of Grain, ii.
Saltpetre may be made to act as a nitrite by dissolving it in water in the strength of about fifty grains to the ounce, soaking blotting-paper in the solution and letting the paper dry.
That this unit is quite distinct from the Persian 86 grains is clear in the Egyptian weights, which maintain a wide gap between the two systems. Next, in Syria three inscribed weights of Antioch and Berytus (18) show a mina of about 16,400, or 200 x 82.