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The actual coA"fficient sought is the difference effected, in functional value, in one of two independent variables. For all formulA| in differentiation are constructed on the hypothesis that only one of two variables suffers change. The differential coA"fficient has yet to be determined which shall express the developmental changes in two variables at once.
In like manner, in the Atlantic, when the sun is far to the north, the great deserts of the western angle, or shoulder of Africa, become as vehemently heated, or more so, perhaps, than Mexico, and this draws the air from the equator, so as to produce the south-westerly winds I have already spoken of in the troublesome range called the Variables.
In 1889 Vogel, with the Potsdam spectrograph, actually found that the luminous star is receding before each eclipse, and approaching us after each eclipse; thus entirely supporting Goodricke's opinion. There are many variables of the Algol type, and information is steadily accumulating. But all variable stars do not suffer the sudden variations of Algol.
When the wind got much lighter and we were afraid of losing the trade altogether, for although at this season of the year it prevails much further from the Southern towards the Northern Hemisphere, yet we can seldom hope to carry it beyond the equinoctial line, where we expect to get into what is very characteristically called "the variables": at one season of the year, these winds are very light and changeable, with frequent calms and occasional thunderstorms and waterspouts: at another season of the year, the weather is dark, gloomy, squally with occasional calms and much rain, until we advance to 12° or 14° N. latitude, where we usually fall in with the N.E. trade wind, however, ships are sometimes fortunate enough on leaving the Southern Hemisphere for the Northern, particularly in the months of May, June, and July, to carry the S.E. trade to the northward of the line, even until they fall in with the N.E. trade.
We have presented to you, in a brief way, the fundamental principles of the science of character analysis and the nine fundamental variables in man to which those principles apply. Are we not justified in saying that a body of knowledge which has been so classified and organized that the main fundamental facts of it can be presented in a few pages, is, indeed, a science?
The western head of the Gangetic delta is thus placed in what are called "the variables" in naval phraseology; but only so far as its superficial winds are concerned, for its great atmospheric current always blows from the Bay of Bengal, and flows over all northern India, to the lofty regions of Central Asia.
In this theory, the representative system is considered dependent on the temperature of one or several other variables, such as, for example, a chemical variable. A similar idea has been developed in a very fine set of memoirs on nickel steel, by M. Ch. Ed. Guillaume.
Each of the twelve following variables has an important effect upon the answer. The figures which are given with each of the variables represent the effect of this element upon the cutting speed. "The proportion is as I in the case of semi-hardened steel or chilled iron to 100 in the case of a very soft, low-carbon steel."
Intelligence deals with the variables of life, leaving to instinct the basic reactions, but it is in these variables that intelligence meets situations that of themselves would end disastrously for the individual. Not a line, so far, on Will. What of the will, basic force in character and center of a controversy that will never end?
After we have passed this belt of calm and light airs we shall get into the regions of the north-east trades, which will carry us along at a fine rate till we get into the very worst part of the ocean for trying a person's temper, called the Doldrums. Remember to ask me more about it when we get there. You will remember, then, the Variables are to the north of the Tropic of Cancer.
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