As there were no ligatures at this time in long-s +k ( and very few in long-s +b), setting a long-s before a letter with an ascender at its left side (likek orb — or likef, for which there likely never was an English ligature with long-s) would break its kern against the ascender. Hence, to avoid fouling, a round-s was often used in this environment (though sometimes a long-s was set, along with a protective space under its fore-kern, which created a "pigeon hole" in the word in which it appeared, [...])