there is as strong an association between the eye and the place of locality, as there is between the ear and any note in Music; only people in general are total strangers to the former, while many are familiar with the latter; and the reason is because the association of objects and ideas, with the loci of places, have never been taught by any of the Schools to be put into practise; but was this mode to be adopted it would save much time and trouble, in the prosecution of many laborious studies. BOTANY. The names of the classes and orders in Botany may be learned in a few minutes. Look to the 1st square, and pronounce Monandria-2d, Diandria, &c. The word joined to the class contains the number of orders in each. This being once learned, you may call it forth in any order as the 5th, 10th, &c. You may recollect the 15th class immediately by fancying you see a Tea-tray hung up in your 15th square, as the two first syllables of the one nearly agree in sound with the other. The 5th class will be remembered by seeing in the square a pen, and an ape-the pen will remind you of Pentandria, and the word ape will give you the number of orders.-To assist those unacquainted with the Greek, many other objects may be taken advantage of, to facilitate the learning these names.-Remember that the first 13 classes all end in andria. The orders are taken from Dr. Turton's System of Nature. N. B. Whatever else concerns the systematic tables of Botany may be united to this. MINERALOGY. Nothing can be more easy, than to be able to refer to the different clasess of Mineralogy, by the assistance of the compartments; for these things being all conspicuous objects, it is only to bring before the eye of the mind all such as compose a class, into that square which gives the number of the class. Examples. The first class is composed of such bodies as will yield to the friction of a file, and such as will not yield to the friction of a file. To put you in mind of this class, fancy you see a file lying in your first square, and a piece of some metal, and a diamond, the first will yield to the friction of the file, and the other will not.-The second class is known by rubbing the angular parts of one mineral, against the angular parts of another mineral-in this square then, you may fancy that you see minerals of square and triangular shapes, &c. To bring to your recollection these bodies which constitute the third class, imagine you see a hammer in your third square; as such things that yield to the stroke of a hammer (but with difficulty) and such as are brittle, (as glass;) and such as are crumbling, (as chalk, &c.) belong to this class. In this manner, may all the classes in Mineralogy be associated with the different squares; and this systematic arrange ment, prevents that confusion in the mind, which often occurs when the memory is unassisted by the imagination, ; CHEMISTRY. Every thing wherein numbers are concerned in Chemistry, may be greatly assisted by this Science. To express the number of degrees of heat sufficient to reduce any body to that state of fluidity called the melting point.-Join to the name of the thing a word that is expressive of the number of degrees. Example: Lead melts at 594 degrees of heat;-Bismuth, 576;-Tin, 442;-Wax, 142; and may be expresed by words, thus,-Lead, lets-Bis, lupin-Tin, hooked-Wax, booked, The constituent parts of bodies may likewise be easily remembered. We will take for Example, that of Wax.-100 parts of Wax contain 82.28 of Carbon: 100.00 The first word being an whole number, and the second the decimal part of an hundred, you must take two words, then the first will denote the whole number, and the second the decimal part, which united to the radical part of the word will stand thus-Carbo red, deer-Hydro cap, pad. You will perceive that (red) is 82 whole numbers, and (deer) 28 parts, &c. |