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The remarkable linear arrangement of volcanic vents has a significance that is well worthy of fuller consideration. There are facts known which point to the cause of this state of affairs. It is not uncommon for small cones of scoriae to be seen following lines on the flanks or at the base of a great volcanic mountain. These are undoubtedly lines of fissure, caused by the subterranean forces.
There is nothing more curious than this mixing of the two sexes, when we know with what precision the Osmia separates them in a linear series, where the narrow width of the cylinder demands that the cells shall be set singly, one above the other.
In order that the situation and character of the principal mineral deposits in California may be ascertained, I recommend that a geological and mineralogical exploration be connected with the linear surveys, and that the mineral lands be divided into small lots suitable for mining and be disposed of by sale or lease, so as to give our citizens an opportunity of procuring a permanent right of property in the soil.
Some are linear reefs, others atolls* more or less distinct in character, and the remainder are usually round or oval. Viewed as a whole they form an interrupted chain, with numerous deepwater channels, which terminates in the West Barrier Reef of the chart but is connected with the coast of New Guinea by a bank of soundings, with, probably, a well-defined margin.
The type forms in light and shade are less pronounced than those of linear construction, though through all compositions of effect, certain well defined schemes of chiaroscuro are traceable. As soon as any one is selected it rests with the artist to vary its conventional structure and make it original.
The linear impulse in composition therefore plays a part in emotional art independent of the subject itself. Pictorial art owes a large and increasing debt to decorative art and no small part of this is its simple beauty of line. It is rare however to find the painter governed in his first conception by any positive linear form.
If the reader will make simple line diagrams of but a few pictures, this point will be made clear, and it will be found that such diagrams which represent either the actual lines of direction or lines of suggestion from point to point or mass to mass will comfortably fill the quadrilateral of the frame as a linear design.
It may sometimes be difficult to determine, from the involutions of its linear sculpture, what were the natural forms which originally suggested them: but we may confidently expect that the grace of their arrangement will always be complete; that there will not be a line in them which could be taken away without injury, nor one wanting which could be added with advantage. SECTION XLI. Farther.
In many other vertical linear sections of the same series, of course, corresponding beds will occur in a similar order; but, however great may be the probability, no man can say with absolute certainty that the beds in the two sections were synchronously deposited.
I have stated that both the reddish mud and the concretions of tosca-rock are often penetrated by minute, linear cavities, such as frequently may be observed in fresh-water calcareous deposits: were they produced by the burrowing of small worms?
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