C 613 ) 
They confider alfo, that there is no lefs difficulty in knowing 
and dircerning the Jujfces that may be mingled with the Minerd 
waters,and particularly thoft that receive no Concretion,and that 
do not communicate to thefe Vv^aters any fenfible quality: For thofe 
liquid and totally volatil Juyces dopafs away in thediftillation 
with the matter of the wacer,and do not manifeft themfelves but by 
fucb efFefts as JimpU watercannot produce. 
They note further, that thofe Juyces which are called Concrete, 
becaufe they are condenfable and refoluble, leave fediments that 
render them vifible and palpable after the dift illation or evapora- 
tion of the water wherewith they are mixed ; but that 'tis difficult 
todifcern the fpecies and proprieties of them, if they have not 
fome referablance with thofe that are known, or if there be many 
of them together* 
As to SdtsdiVid Earfhs.ihey look upon them as the moft fenfible 
and themoft common matters of thofe that are mixed in the wa- 
ters of Fountainsand WelIs;fo that there is almoft no Earth which 
is not participant of foiiie Salcdiffbluble in the waters that pafs 
through; and the current of thofe waters doth alfo carry always 
with it fome fine and fubtil Earth. But though thefe are the fub* 
ftances that are moft manifeft in thefe waters;yet they find,that the 
knowledgeof thefe Salts and Earths mixed in the waters is not al- 
ways fo diftindt as to enable us to determine the fpecies, and to 
give a certain Judgement of their proprieties. 
They obferve further, that there are few Concrete Salts that are 
known to usjand that there may be many that have nothing like to 
Common SaUyNifre^Mom and Fitriol^'which are the four moft vul- 
gar of the concrete Mineral Sa]ts.Thofe,whofe difpoficion to con- 
cretion is not finifb't , and which are yet erobrionated and as 
'twere in their femlnality or firft Being, are lefs knowable in that 
ftate 5 and thofe that are more formed and already concreted or 
capable of concretion, have not fimple and homogeneous fub- 
ftances in each Jpecies. 
The Salt, that is called Common-Salt, is obftrv'd to have two 
different portions mixed tGgether;the(?;^^ iscondenfedand cryftal- 
lifed by cold and inmoifture, after the evaporation of a part of 
the water wherein this Salt hath been diffolvedjthe other will notr 
be cry ftal lifed nor condenfed but by a total evaporation of the 
reft of the water. The portion that's cry ftallifed by cold and in 
moifture, is the moft fiilphureous, and by its fulphiireity it will 
miK 
