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The report discribes an improved arc-fusion method for the production of high-quality single crystals at comparatively low cost.An arc is established in a first refractory sinterable powder pack to form a first internal cavity. A port is formed in the wall of the pack, and a second powder pack is formed within the cavity, this second pack consisting of a selected refractory sinterable powder from which single crystals are to be obtained. An arc is established in the second pack to melt only an internal portion thereof, forming a second internal cavity. Molten material derived from the second pack collects in the second cavity, cooling and crystallizing therein. A port is formed for withdrawal of the crystallized material, from which single crystals subsequently are harvested. The second cavity may be so used in additional crystal-growing runs. (Author)