United States or Nigeria ? Vote for the TOP Country of the Week !
It will be observed that this first broad division of the third of the elemental kingdoms is, so to speak, a horizontal one that is to say, its respective classes stand in the relation of steps, each somewhat less material than the one below it, which ascends into it by almost imperceptible degrees; and it is easy to understand how each of these classes may again be divided horizontally into seven, since there are obviously many degrees of density among solids, liquids and gases.
We found that it acts through air or in a vacuum in a single straight line, without deflection, and seemingly without diminution. Most solids, and especially metals, according to their electric condition, are more or less impervious to it antapergic.
Connect millions of millions of particles by pairs of rods such as these of this spring balance, and we have a group of particles constituting an elastic solid; exactly fulfilling the mathematical ideal worked out by Navier, Poisson, and Cauchy, and many other mathematicians, who, following their example, have endeavored to found a theory of the elasticity of solids on mutual attraction and repulsion between a group of material particles.
Sundry discoveries are afterwards detailed, showing how completely the development of statics has been achieved by considering its problems dynamically; and before the close of the section M. Comte remarks that "before hydrostatics could be comprehended under statics, it was necessary that the abstract theory of equilibrium should be made so general as to apply directly to fluids as well as solids.
Would not the slightest reflection have sufficed to prove to him, that the fluids, the solids, of which his body is composed, as well as that concealed mechanism, which he believes to be independent of exterior causes, are, in fact, perpetually under the influence of these causes; that without them he finds himself in a total incapacity to act?
He is said to be in health when the fluids and solids of his body concur to render him robust, to keep his mind in vigour; when each lends mutual aid towards this end. He is said to be in confusion, or in ill health, whenever this tendency is disturbed; when any of the essential parts of his body cease to concur to his preservation, or to fulfil its peculiar functions.
With the symmetry of solids, or symmetry with relation to an axial plane, no such simple movement as the foregoing suffices to produce or explain it, because symmetry about a plane implies four-dimensional movement. It is easy to see why this must be so.
Such a movement we can reason about with mathematical definiteness: we see the result in the right- and left-handed symmetry of solids, but we cannot picture the movement ourselves because it involves a space of which our senses fail to give any account.
It is reckoned a medicine of great efficacy in some cachectic and chlorotic cases; in weakness of the stomach occasioned by a load of viscid phlegm, and in such disorders in general as proceed from a cold sluggish indisposition of the solids and lentor of the fluids. I have experienced great benefit from it in rheumatic pains, particularly those of the fixed kind, and which were seated deep.
You will find, in hydrostatics, that the attraction of cohesion is far less powerful in fluids than in solids; viz. that persons who have been converting their 'solid flesh' into wine skins, cannot stick so close to one another as when they are sober."
Word Of The Day