Commistion

Of muche aboundant ſuperfluous bloude contayned in the hole body: oꝛ of muche commiſtion of the melancholy humoꝛ ⁊ the bloude to gether / by the which the bloude is enfyꝛed and chawfed: and ſo diſtendeth openeth and ſetteth abꝛoade the vaynes whiche deſcende to the matrice.

Source: wiktionary

And there is ſcarce any Natural Body, wherein the Form makes ſo ſtrict, durable, and indiſſoluble an Union of the parts it conſiſts of, as that, which, in that Factitious Concrete we call Glaſs, ariſes from the bare commiſtion of the Corpuſcles of Sand with thoſe Saline ones, wherewith they are colliquated by the violence of the fire: and the like may be ſaid of the Union of the proper Accidents of Glaſſe with the Matter of it, and betwixt one another.

Source: wiktionary

Chymiſtry handles all Bodies of the three Kingdoms; it acts by motion, and either unites or ſeparates Bodies by Commiſtion or Fire.

Source: wiktionary