The concluding part of L. Trouvelot's article on rearing the American silk worm (Telea polyphemus) in the United States. It describes raising larvae outdoors in netted woodland and under a screened shade, with practical advice on feeding branches, moulting, water and cocoon handling. It also reports experiments on the cold tolerance of chrysalids, whether the pupa needs air (cocoons coated with starch and shellac), the impossibility of a second brood, and delaying hatching by cold storage. Two plates show the female and male moths.