t f equal extent with that which mr j al observation nor is there any part of europe of equal where the rocks lie so or where the f can be so well illustrated as on this of america mr has and described an extent of country actual from boston to and has marked far f than we could expect from any single observer the lines that the primitive and secondary the t boundary of the rock salt when it is that mr has travelled over all europe as a and twenty years of his life to this study the great of this will be readily perceived it i by two very interesting coloured maps the ai leading features of the country described is a present worthy of it man of to make to hi country it in hoped that persons in authority will use their en l to procure a of every state by dis l so that we may form some rational conjecture of the mine j riches which we � eat within the of the earth and acquire some efficient means of getting at them the next paper a� c by esq is not of a nature to admit of any j interesting to our readers no of to l if of thi in the n by william tliis lion has been determined by by means of on and mean result of gives the distance of the from ob near london equal to t jo v time no the figure of the earth and the ra hi by principle upon which the author proceeds will be understood from the extract now it hat hi of several eminent m i particularly by d u on e of the earth by la place in his ni fix of gravity in from ua lor to the note ia as the square of i lie l force arising from of the on i � to very in that the of the earth vary in and to any function of hie distance from the and the parts of the are so as to obey the compound gravity or the joint action attraction and the force aod as the length of the in a second or in any given time is directly as t gravity the length of the follows the same ti with tlie gravity in parting from the lo he pole aud pre table may be considered lu a able o ia let be the length of the y an unknown fixed co efficient j any and the length of the in then agreeably to the law gravity just state we have the e r n j y sin x a which x and y are found we stall have the value of r or thi measure of gravity in every latitude it is certain that whale numbers we substitute cur r and y we cannot such v for r as are exactly with those given in the table according observation though the are not and may justly be ascribed to the inevitable errors ment in perhaps with a small in the of the earth from the conditions that have been as the basis of the physical and l a place since therefore it is to reconcile completely the theory with the all that can bo is to such for x and y as will cause the y sin a to with the numbers in the tliis is by a rule published by the writer of this article the no y in and which applied present us to discover such lor x y as will render the sum of the of the between several numbers of the aiid corresponding of r y sin a the least possible no s on leaden bv william jones this ia � proposal to substitute of lead oi paper on the grounds of more security in handling and firing made of lead than those of paper and also will k and the better pi � ore strong marks practical good sense in p� i the seems worthy the of who direct our tv � f the j no tables of the of mountain in tht cf and from and of by a ci tain of the corps of no of the used or the or he of and were to but wc presume from captain s situation aad ch that none of these were neglected should be checked by the on the temperature of water whether the ther observations here alluded to were of this nature we know not any supplied in the which ih in the ie no on the and of the of north america in a from h to mr from the number and extent of and of ii people from the � up used a population in former times for the north american continent far greater than what wc now it the is curious and and will well an perusal to u reader who feels interested in the of continent it will be fo in thi number of the magazine no an made on a� h a for and from that hy j � cloud mr cloud the ore of in and it in the by the exposed to a white heat a gray which was by the om b ow first invented by mr hare and greatly and improved by mr cloud many years before dr s pretended discovery the thus obtained was rolled out and proved to have a gravity of the in the remaining solution were by mixed with four of silver and in which took up the silver and the the silver was by and the by of and then with of the the and gold were then se by and the remained in the black powder which when and by the was of for further details we refer to the itself which is very creditable to this able no an to ascertain the re me by ji 