C after s is silent in scion, scent, scythe, muscle, sceptre, science, sciatica, sciolism, scissure, scission, scissors, scenery, transcend, descend, descent, viscid, crescent, proboscis, fascinate, viscera, ascetic, excrescence, corpuscle, acquiesce, coalesce, rescission, abscission, putrescence, ascendency, susceptible, irascible, viscidity, eviscerate, lascivious, resuscitate, scimitar, scintillate, phosphoresce, deliquesce, effloresce, effervesce, transcendent, condescend, condescension, convalescence, concupiscence, reminiscence, acquiescent, iridescent, arborescent, susceptibility, scenography, sciography.
"Guide to the Kindergarten and Intermediate Class and Moral Culture of Infancy."
Elizabeth P. Peabody Mary Mann