

Ufl 



I,.- hours VM!! t.il.o care of thonwelvoii." Thin in an u 



1'vo nota. thu in mountain's brow ; I'vr 



o deep, 10 calm, tunl so holy . m noft on tho thrill which 



. i M thwart tlio soul in the boar of repoM. 



Blest l>o the day I 'leaped tho wrangling orew from Pyrrho'H maze 

 :unl KpiuurniT Bty ; iin.l liuld liitfh conrene with the godlike few, who 

 art, and ear, and eye, toach beauty, virtu.;, truth, 

 vi, mill ni'-lody. 



i:ut ; 1 1. uven's just vengoanoe dar'nt defy, tliia deed, with 



>ss tears, shalt soou deplore. 



ruler of the inverted year ! thy scatterM hair with sleet- 



los till .1, thy breath congeal'd upon thy lip*, thy cheeks friu^'d 



L beard made white with other snows than those of age, thy 



flojohoad wrapt in rlniuls. a leafless branch thy sceptre, and thy throne 



a Hlidiir-r cur, indebted to no wheels, but urg'd by storms along its 



way, 1 luvo th. .-, oil unlovely as tltou scom'st, and dreaded as 



irt ' 



.id I passed by, and beheld your devotions, I found an altar 

 with this inscription, " To TIIE UXILNOWN GOD." WLoin therefore ye 

 ignore ii liiui declare I uutu you. 



XIV. THE ASTERISK, OBELISK, DOUBLE OBELISK, SECTION, 

 PARALLEL, FABAOBAFH, INDEX, CARET, BREVE, AND 

 BRACE. 



The student should take particular notice of the following 

 marks, so that he may call them by name, and discover their 

 use in the following examples : 



An Asterisk, or Star. 

 t An Obelisk, or Dagger. 

 J A Double Obelisk. 



5 A Paragraph. 

 A Section. 

 II A Parallel. 



78. The Asterisk, Obelisk, Dotible Obelisk, Paragraph, Section, 

 Parallels, and sometimes figures or letters, are used to show that 

 there is a note at the bottom of the page. Wlien. many notes occur 

 on a page, these marks are sometimes doubled. 



79. The Paragraph was formerly used to show the beginning 

 of a new subject in a chapter. 



80. The Section is generally used to sub-divide chapters into 

 lesser parts. 



81. The Index or Hand igg* points to something which 

 requires particular attention. 



82. The Breve ~ is placed over a letter to show that it has 

 a short sound ; as, Helena. 



83. The Brace , , is used to unite several lines of poetry ; 



or. in prose, to connect a number of words with one common term. 



84. The Caret A is never used in printed books ; but in 

 Vrriting it shows that something has accidentally been left 

 ut ; as, 



recited 

 George has his lesson. 



A 



OBS. When several asterisks or stars are placed together, 

 diey represent an ellipsis. 



Examples. 



Many persons pronounce the word HelCna* incorrectly. They call 

 it Helena; and the words acceptable, rec'ognise, Epicure im, and 

 Europe'an, are sometimes incorrectly called acceptable, rccog'uisc, 

 Epicurean, and Euro'pcan. 



The leprosy, therefore, of Noaman shall cleave unto tliee. 

 * * * * And he went out from his presence a lc?per as white as 

 snow. 



The Cougar t is the largest animal of the cat kind, found in North 

 America ; and has occasionally received the name of the American 

 lion, from tho similarity of its proportions aud colour to those of tho 

 lion of the old world. 



The keeper of tho elephant gave him a gallon of arrack, J which 

 rendered the animal very furious. 



I fell upou my knees o.n the bonk, with my two servants, and the 

 dragoman of the monii. 



The history of Joseph is exceedingly interesting and full of 

 instruction. || 



* This with the St. before it, is the name of a small island t 

 on the west of Africa, noted for the exile of Napol 



t Pronounced Coo'-gar. The name given to this animal by the 

 Americans generally is painter, evidently a corruption of panthtr. 



J Arrack is a very strong spirituous liquor. 



Dragoman means an interpreter. 



II The whole history of Joseph will be found in the Bible ; from the 

 37th chapter to the end of the book of Genesis. 



It was a cave, a huge recees, that keep* till June December*! i 

 a lofty precipice lit (rout, a uUmt Uru . below. 



C-e-o-u.i. \ 



;. I 



) 



are pronounced like.!*,. 



8-c-. 



u-s, 



See where the rector's' 

 in new enclosed I*ad*,-l*ad* wrested from the indigent and poor. 



\, .-aiihi:, f.,r*.,.jiii. h- 1: .,i.i ti.. : rflkfi OOM H 



When the young blood danced Jocund through hi* reins, 'tti Mid 



I.. . :... i ,....-;; i .-.. i MB Itamm 

 TLeir wanU are promised bridewell, Jj or the stock*. 



-. VI. 



FINDING O !'> OF GRAVITY. 



IN the last lesson it was shown that every man* of mattir has a 

 ni : of gravity, but we did not inquire bow mob 

 found in bodies of known shape*. To thai part of < 

 wo now proceed. 



As a general rule, tho problem require* high mathematics for 

 its solution ; but there are some cases in which the centre can be 

 discovered without much difficulty. I take, first, the practical 

 method by suspension, which gives it exactly whenever the body 

 is of a uniform thickness, such an a deal board, or card, or piece 

 of paper. The two opposite faces should be equal and alike, 

 the edges being cither perpendicular or square to them, or 

 running off at the same slope. In all such emeu it is evident 

 that the centre of gravity is within the substance of the board 

 half-way across between the faces. If, therefore, we can find 

 the point on either face under which it lies, by boring straight 

 in half-way at that point, tho required centre is reached. 



But how find the outside point ? Let the board be of any 

 irregular shape, as at a (Fig. 27), and bore two holes through it 

 perpendicularly at any two points, near its edge, o and Q. Pot 

 a straight iron rod now through o, and on the rod, by a small 

 ring, hang a plumb-line, o A, close to the board. Put rod, line, 

 and board now across two supports, so arranged that the rod 

 may be Jiorizontal. Tho board having settled to rest, the centra 

 of gravity will, as I showed in List lesson, be somewhere behind 

 the plumb-line. Chalk now, or mark with a pencil, the coarse, 

 o A, of this line on the board. Perform the same operation with 

 the hole Q, pencilling in like manner the line Q B. What now 

 have we ? Two lines, behind both which the centre of gravity 

 lies; whence we infer that their intersection, o, is the point 

 required. 



But the method in part applies to bodies which have not 

 parallel faces like boards, or are not cut perpendicularly, or at 

 the same slope across at their edjes ; but in snch eases the 

 sought centre is not midway across. All that is necessary is 

 that there should be one flat face on it, as in that represented 

 at b (Fig. 27). Yon can still determine the point o, behind 

 which the centre of gravity lies, by boring two passages at o 

 and Q, perpendicularly to the face, into its' substance, suspending 

 and marking tho lines o A, Q B, as before. The centre of 

 gravity will still be behind the point o ; but tcfccra, or how far 

 in. is another question, tho answer to which depends on the 

 shape of the body. 



If the board which above first occupied our attention be op- 

 posed to become very thin to be cardboard, or even paper the 

 body becomes almost all surface, and the point o and the centra 

 of gravity nearly coincide. I they become identical ; 



and tho operation is sometimes spoken of as " the finding of the 

 centre of gravity of an area or surface." In strictness, a mfare 

 cannot have a centre of gravity, for (see Lesson I. on Gee: 

 it has no thickness, and therefore can have no \ccight, no force, 

 no centre of force. But, for all that, the inquiry is useful. 

 We may agree, for mechanical pwposet, that a surface should 

 have such a centre ; and the best course for that purpose is to 

 give it a thickness the smallest we can conpeiTO, namely, that of 

 one particle or atom. Imagine, then, a triangle, or portv 

 circle, one atom thick; and let us agree that, when we ;. 



V Tarn is a small MM, high up in the mountain*. 



* A clergyman. 



ft Cure. The office of a clergyman. 



J* Stolt. A lonp robe worn by the clergy of England. 



JSruUiwU. A house of correction. 



