nap(h)tha
pla(i)ster
slak(e)ing
earthen-ware, earthen ware
“sulphurous”, “naphtha” are used in the Contents and the Index; “sulphureous”, “naptha” in the body text
forms in “-xion” (such as “connexion”) appear only in the Contents and the Index
Volume I has more archaic forms than Volume II:
“shew”, “inclose” are sometimes used instead of “show”, “enclose”
“carbone” with final “e” appears in one Plate caption. (In the same plate’s header, the “e” appears to have been removed by the engraver.)
“develope(ment)” is more common in Volume I, “develop(ment)” in Volume II