2i8 MEM O IR S of the 
internal Sranchiify and is faftened to the central mufcles. The 
central mulclc is of an orbicular form, white and fmooth for a 
great part of its furface, where it adheres to the fhell j on the 
left fide it is furni/hed with another whiter and lacerated mufcle, 
and more firmly faltened to the fhell. 
asa Fig. I. Plate VII. the mouth and head 5 hi? the black Me- 
conium 5 c the heart; dd either the Tericarditim^ or bladder of 
urine j eeeee the Re5ium riding over the 'Pericardium j fffff 
the great central mufcle , gg another lacerated mufcle adhering 
ftrongly to the /hell ; hbbh the internal Srancbiie-j //the extre- 
mity of the extended Uterus-, furnifhed with two apertures, as in 
hermaphrodites; kk the luperior whitifh part of the Uterui-^ III 
the infoior yellowifh part of the Uterus -^ mmmmm the variegated 
border, or the Muf cuius retiarius fecundus. 
A Storm of Hail in Hertford (hire; ly Mr. Rob. Taylor. 
Phil. Tranf. N° 229. p. 577. 
ON Tuefday May 4th, 1691 ^^ Hit chin in Ht;rtfordpirey 
about 9 o'clock in the morning, it began to lighten and 
thunder very much, with fbme great fhowers between; it conti- 
nued till about two o'clock in the afternoon, when on a fudden, 
a black cloud arofe fbuth-wefl, the wind being eafl and blowing 
hard ; then there fell a fharp fliower with fbme hail-ftones, fome 
of which meafured 7 and 8 inches about; but the extremity of 
the ftorm fell about Offlcy^ where a young man was killed, one 
of his eyes ftuck out of his head, and his body was all over black 
with the bruifes; another man nearer to Offley efcaped with his 
life, but was much bruifed. The hail fell in fuch vaft quantities, 
and fo large, that it tore up the ground, fplit great oaks and 
other trees; it cut down great fields of rye, as if it had been 
done with a fcythe, and deflroyed feveral hundred acres of wheat, 
barley, t£c. there fell Ibme hundred thoufand cart-loads ; they 
mealured from one to 13 and 14 inches; their figures were va- 
rious, fbme oval, others round, others tapering, fome flat. 
^he Height of the Mercury at the top of Snowdon Hill 5 by 
Mr, Edm. Halley. Phil. Tranf! N^ 229. p. 582. 
A/fATz6y 1^97, between one and two in the afternoon, on 
-^^^ the top of Snowdon-hill Mr. Halley repeated thrice the 
*Torrir.ellian experiment, and as often found the height of the 
mercury, 25, i inches; and being come down to LlanberriSy at 
the foot of the hill, about 6 that evening, he found the mercury 
by a triple experiment, to ftand at 29, 9 inches, very near the 
lurfacc 
