[ 235 1 
By all that I have been able to obferve, the plates 
feem originally to have been horizontal : in fome I 
have, which are convex, they are apparently fo ; and, 
as far as I could remark, in all, where the plates ap- 
pear. Tho’ it is probable, where the end of the 
end of the hone is concave, the laminas or plates have 
in fome meafure been prefs’d in that form ; tho’ I 
could not certainly dihinguifh it in any of this kind. 
Sometimes a joint near perpendicular begins as in 
a point from the fide, and extends into that hone, 
and into all the hones of the pillar, which are be- 
neath it ; fo as (when it has run the length of one 
hone) to take off either two fides of the hones, or 
pillar, or one hde, and part of two fides. This in- 
deed fometimes happens to be in the middle of the 
pillar, and in the fame manner all the way down, fo 
as to form two dihindt pillars. Thus I have fome, 
which, by this means, have a fide lefs at one end 
than at the other; and I have one, in which the 
fpherical part takes off at one end two fides of the 
multangular figure, and makes part of a circle, as in 
fome it takes off all the fides at one end ; or, more 
properly, the hone remains in its original fpherical 
figure. The pieces, which fill up where the hone 
is not prefs’d into a multangular figure, fometimes do 
not break off, as may be feen in the model. 
Of the other models made by Mr. Drury, four of 
them fit to one another, and reprefent part of a pil- 
lar in the Caufeway : The feven models not referr'd 
to, fhew a variety of hones j the meafures of all of 
them are marked in inches, and they are made by a 
fcale of a tenth to an- inch. The ends, which are cut 
fmooth in the cork, or are marked with a pencil, 
G g 2 are 
