C 394 ) 
they would turn into, gave them a piece of Larus^hut that, it 
fetms, agreed notfo well with them, for they died within two 
daies. 
I have often beenpuzlcd to give an account of t\\oT^ Phce/to^ 
mem^ which are coiiinionly called Vairy Circles \ I have feen 
many of them, andthofeof two forts, one {bniare^ of feven 
or eight yards diameter, awaking a round path fomething more 
thanafoot broad , with green grafs in the middle; the others 
like them, bur oF feveral bigntfTes, and encompaflfed with a 
circumference of grafs, about the fame breadth.^ much frejber 
and greener than that in the middle. But my worthy Friend 
Mr. Walker^ a Man not only eminent for bis skill mGeometrf, 
but inall other Accomplifliments, gave me full fatisfadlion from 
his own Experience. Ic was his chance one day, to walk out 
amongfl: fome Mowing grafs (in which he had been but a little 
while before,) after a great ftorm of Thunder and Lightning., 
which feemed by the noife and flallies to have been very near 
him. He prefently obferved a round Circle, of about four or 
five yards diameter, the rim whereof was about a foot broad, 
newly burnt bare, as the colour and brittlenefs of the Grafs- 
roois did plainly teflifie. He knew not what to afcribe it unco 
but the Lightning, which, befides the odd capmios remarkable 
in that fire in particular , might witiiout any wonder, like all 
other Fires, move round , and burn more in rheextremitiesthan 
the middle. After the Grafs was mowed, the next year it came 
up more frelli and green in the place burnt, than in the middle, 
and at mowing time was much taller and ranken Thus far Mr, 
^efipps Letter • I fhall only add , that you will much oblige 
him toaflift him with fome Queries abouc the fulminating Damp 
^-such j^erits as ^^'^^^ wJiac convenient fpeedyou can. f 
are here dtfund^ 
at already difpatched away, with hopfs, they will /ho ily receive an anfiver* 
As to the vomiting of ft range Worms , I give you a late in- 
ftance not unlike that in this Letter : 
A Sonof Mr. living not far off Rippon\ about nine years 
of age, in the month of Eebruary laft was afflified with great 
pain in his Stomach, and continual Vomitings. A Powder was 
given^ wherein was a fmail quantity of MercuriusMcu. He 
there- 
