( ' 7 6 )

Abstinentia thema Lentulus noster ad Divum* Jacobum Primum, RegemAngit# Potentillimum pertractavit, ignota tum Tranfpirationis hujuiqueprincipii Circulationis causa, varie Ratiocinatus; sed ad hanc reflectentes, ho-minem Respirare, adque Substantiae deperditae Restaurationem refici, ArsStatica docet plus insensibiliter e corpore excerni Transpirandc» quam peromnes Excretorias Vias sensibiliter excludi. Ut Vir Robustus in Actionepermanens, 8 Ltbrarum Potu Ciboque singulis diebus saturatus, Tres tan-tum vel in summum 4 Lib. manifestis in Excrementis deponat, facta tamenDigestione amplius non ponderet quam Cibum ante sumptum ; Hinc CoSii-onum Energia omnia imminui, inque Spiritus tandem resolvi, & Transptra-tionis, in solutione Morborum insensibili & Httticorum devorata Substantia,veritas consistit; qua non ob Epidermidis constipationem procedente, nonopus erat Resektione • secus Aer Inspirari ad Spirituum Vitalium Refectionemdebuit, ut Expirari postit, sicque in Motu manere; qui ipse Aer Inspiratus,Incrassatus, in Vasis in Serum versus, Urinandi materiam tempore Abftinen-,ti<£ commodam praebuit, ut Hydropicos saepius cernimus solo Aere, aquosisfilis particulis, increscere.

A* «f z. Two of thesc Stones beingsent to the Royal Society by Dr. Stg. Kontg^r^Fred^sfar? ’ in order to the better Inquiry into the Nature ofthis Helvetian

ib.f.jo^.ti.zSz.Concretion,! made it my firstAttempt to compare it with its Relative Pondusf i+o. t0 Water, having satisfy’d my seif that there is a Standard of Gra'vity so com-

petent to all Real Stones , that where they decline from this Standard weJiave good Reason to question those Concretioris whether they are Stones orno. The Standard oi Gra'vity for Real Stones, I find to be gencrally abouc.2 to 1 of Water and a little more, This Concretion was very Hard andleemingly Heavy, but it v/as really very Spungy ; for v/hen it lay under Wa-ter there pass’d a good while beforel.could ciear it of the lurking Bubbles,so that it grew Heavycr from cime to time as the Bubbles were expell d,and at last arriv’d near the Standard of a true Stony Concretion, or ra-ther somewhat beyond it. It weighed in the Air 1 2 Dr. 36 Gr. in Water6 Pr. 48 Gr. the Difference 5 Dr. 48 Gr. therefore the Proportion be-rts’ixt this Concrete and Water proves to be as 217 to 100. This extra-ordinary Pondus gives reason to suspect that there may be some MetallickIngrediens in it. >

Whilst I was making these Tryals, I was willing to compare this Mat-ter with common CkaJk which I fotind Specifically Lighter, bearing onlythe Proportion to Water of 180 to 100, Wheretore this Substance be-ingso much Heavycr than Chalk can scarce be tnought a Concretion of sucha Matter.

1 then ccmpared it with Pitrified Mater, being an leide that wasbroken off a Grotto, where a Pemfying Spring did furnish enougli. A pieceof which, of 5 Dr. discover’d its Weight to bear the Proporton of 2 19 toXoo, to that of Water. Our Anomalous Substir.ee being so ntar theWeight of Petris/ d Water , would almost incline a Man to believe it aReal Stone, and the rathet, because we are inform’d the Patient drank.tauch Water. Morecver, the following Experiments upon this Matter,