goo Of Regular Stones. Part III. 
The GREAT-PITHD KNIT-BONE." This is not a 
{ingle one, but a Gutter. They ftand together parallel, 
equal to the thick end of a Tobacco-Pipe-Stal 4 ; without 
exceeding fmooth, and of a yellowiih colour, fomewhat 
like that of the Plates in the Ludrn Helmontij, hereafter de- 
feribed. Filled with a very large Pith, anfwerable to that 
m an Eldern-Branch , hard and ftony, and of a blewiih co¬ 
lour, like that of blew Mark. The fpaces between the fe- 
veral Cylinders , fill’d up with another fort of Stone , of the 
colour of old Elm. The yellowiih Cylinders, being rub’d 
hard, or feraped, hath a ftrong {linking feent: but what 
Species to compare it too, doth not at prefent occur. They 
are prefently dittblved with Spirit of Nitre. 
ANOTHER CLUSTER like the former 3 faving, that 
the Cylinders ftand together] without any, or with little, 
order: and that the brown and blewilh Stones are both 
mixed in Veins, and feveral of the Cylitiders hollow. 
The EMPTY KNIT-BONE. This is neither folid, nor 
hath any Pith, but a Pipe ; yet with a very Email bore. 
Smooth both within and without. And tranfverjly ttriated, 
as the Belemnites, hereafter defcrib’d. 
ANOTHER, fomewhat more hollow. This alfo is 
tranfverfly ttriated, as the former ; but without rough and 
of an Iron-colour. 
A THIRD, moft hollow; knobed without, and of an 
Afh-colour. 
Of thefe 5 >cwes,fee the Relation efpecially of Joh.Chryfto- 
Tri ^'a T'l ,orm Beckjnannm , Phyfick Profeflor at Frank furt 5 (a) who 
obferves, That they grow 111 a fandy, feldom or never in a 
claiy-Ground. Sometimes two mens depth; and with 
Brancheslide-ways. Taper d, as in Plants; where tlnckeft, 
equal to an ordinary Arm; the Email Branches, to ones little 
Finger. The Place where found is noted by a white fatty 
Sand, the reft yellowiih round about; and underneath a 
dark, moift, and fatty putrid fubftance, like rotten-Wood, 
running in Veins and is the Mother of the Ofteocolla. So 
that it fee ms to grow fomewhat after the manner of the En- 
trochus, or Stelechites above defcrib’d. ’Tis found molt in 
Saxony , and the Palatinate. 
This S' tone , as is . seated by its Name, is highly efteemed 
for expediting tPo Coalition of broken Bones; jj hereof 
being 
