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each cube ; when the stone was set, wedged and trenailed,then it was very practicable, by dressing a trenail so as tobecome a ram-rod, to drive as much mortar down the holeas would completely fill every vacancy between the stone andits cube ; insomuch that we soon perceived, that if this wasattempted before the stone was completely trenailed down, itwould very easily raise the stone from its bed, as mightindeed be expected from the principles of hydrostatics : but,being done after such completion, it brought the whole to themost solid bearing that could be wished ; and, when thecement was hardened, answered the end quite as effectuallyas if they had been wedged.

“ It may here be very properly said, that since those cubescould be of little use in keeping the work firmly together,before the mortar was hardened ; and after that had takenplace, they could be of no use ; because the number of onehundred and eight trenails, of which one of these coursesconsisted when complete, being supposed sufficient to keep itfrom lifting and moving out of its place ; as the mortarhardened, and every additional course was an addition of itsown weight upon the former, if those cubes could have beendispensed with in the first instance, they might have beenso ever after. This reasoning I can very well admit to hetrue ; yet, when we have to do with, and to endeavour tocontrol, those powers of nature that are subject to no calcu-lation, I trust it will be deemed prudent not to omit, in sucha case, anything that can without difficulty be applied, andthat would be likely to add to the security. It may fartherbe remarked, that as this building was intended to be a massof stone, held together by the natural and artificial union ofits parts, it would have been out of character, that, whencompleted, it should be beholden to certain parts of wood forits consolidation.

“ I have mentioned, that I originally conceived more thanone way of preventing the courses from shifting place uponone another. My first conceptions were to form a rise (or adepression) of three inches, bounded by a circle somewhatabout the diameter of that in which the joggles are placed ;which step, or depression, would have formed a socket,whereby the courses would have been mutually engrafted,not much different from what nature has pointed out in thebasaltine columns of the Giant’s causeway; but, consideringhow much unnecessary trouble and intricacy would be herebyintroduced, by one part of the bed of the same stone beingliable to be three inches higher than the other, I judged thatthe end would be very sufficiently answered by the muchmore plain, easy, and simple method of joggles ; especiallyas, for this purpose, the firmest and toughest kind of stonemight be chosen, and the number multiplied at pleasure.One plug in the middle, of a foot square, and eight jogglesof a foot cube each, of the hardest marble, disposed in themanner described, seemed, to me, along with the additionalstrength and security arising from the trenails, as also fromthe infinite number of little indentures upon the surface ofthe courses, as well as the lewis holes, each being filled withan exuberance of mortar, which, when hard, would in effectbecome a steady pin ; from the cohesion of the mortar as asolid, promising to be no less than that of the stone, togetherwith the incumbent weight of every part of the buildingabove ; every joint, thus separately considered, seemed, inpoint of firmness, so satisfactory to my mind, that if thewhole of this proved too little, it was out of my power toconceive what would he enough.

“In the morning and evening’s tide of the 17th, we setthe whole of the fifth tier, and consequently the whole of theeight cubes were then inlaid. The morning of the 18 th weagain landed, and in this morning and evening’s tide, though

rough, we had got set five pieces of Circle VI- jec® 3landed the remaining three ; as also one of the large®of moor-stone for the east side (see Plate IV. Figure s oevening’s tide we worked with links, and it began tofresh that we had much ado to keep them in, beingto make a fire of them upon the surface of thewere under the necessity, at last, to quit the rock tv ^jj,

precipitation, and were very glad to get into o ur F eC eS>things being left in the following posture: Two of t 1 nor tli'Tier 6, were simply dropped into their places, on t ^ th®west side, while the third piece, being about a ton, \piece of moor-stone near upon two tons, were chai g6 t jther, and to the work of Course VII. that was alre® ^ urS e,these two loose pieces being upon the top of tn» th 0near the east side ; the triangles were lashed downfloor of the work, as we had practised several trine nj atThe sea became so rough in the night, thatthe transport buoy, was obliged to slip and m tb eharbour. The bad weather continued to increase28th, when there was a violent storm at south-wes • jj 0 a,“The 29th, I perceived with my telescope, ^ roin r jnthe buss to ride safe, but could not see the sheaianything else upon the rock distinctly, except th _ Ill6 wh a JThe day following being more clear, and the sea g bo&subsided, I immediately went on board the ® c *»^ S agS ed ^to reconnoitre. The wind being north-west, 1 gS ibil’*7rock several times under sail, but there was no P vf iiici*of landing. I observed, that not only all th® st° ae3had been completely set was entire, but that the ^ als<jmentioned to have been simply lowered into their P ‘ j )t gtiremained therein, and that the five hundred W ^ ^ c6rested upon the stone whereon it was left. The^^, t pat i

wasshears

and this day the wind being

north-west, and very modern v/° ^

markable, as being the first time of the people ‘^ent: ^till they were obliged to quit the rock for .re \{me bef° re

Met with anvrn- Glreinsta ted, it was some time“The finer, ^ le ordinary interruptions,diting of our w' 3 i° *- le season continued to favour aSbegun iTthTZl 3 ’ WSOmuch ‘to Course VIII,completed on th in T as <ix, ‘mted in five days, b ein S %v eidregukr v 0 nf^ e rn 3th ’ at the hour. Everyth^ «

tinued tZ tll . the 2°th ; so that , in retu rnour works f, U ?i Wn ^ roru ^ le stormy weather for ■

£ S“irrrrrtS*' <

p , s j Was advanced to the fifth cOt land-swells from the south-west " '

series

the building had got so complete a coat of sea-we .

3 only distinguishable from the rock by i t3 f° rrn piece 3 0ars and triangles were entirely gone ; the W eI , e

stone, that had been chained together and to the 'also gone; the windlass frame broken and muc . jjaof’and the roll gone ; the fender piles and the transphowever, remained in their places. an y C ° U e

“ It was the 3rd of September before themake a landing to do anything upon the rock ; f iay 9 > ]the 18th ult., there had been an interval of fi ea tlief>. 1which we had been totally interrupted by bad eve rytln a »the very prime part of the season. However vv0l -k, t* 1 ^having been expedited on shore, to get refitted oU r peday I went out therewith, and began to set F ^ ptfshears, windlass, &e., and with the shears , (he °,Jof Portland, of Circle 6, which was set, .as a ® t j ]e tidethat had been left loose in their dovetails , ^ bef° re

flood coming on, had deepened the water too mcould try to get up the other. finished

“ September the 5th, the seventh circle was - pie, >

eighth begun ’ " ’ ’ Mdmr v»‘ -'' r6 -

north-east to