This section is from the book "A Handbook Of Invalid Cooking", by Mary A. Boland. Also available from Amazon: Handbook of Invalid Cooking.
1/4 Box of gelatine. 1/4 Cup of cold water. 1/2 Cup of boiling water. 1/2 Cup of sugar. 1 Cup of orange-juice. Juice of half a lemon.
Soften the gelatine in the cold water by soaking it for half an hour; then pour in the boiling water, stirring as previously directed until the gelatine is dissolved; add the sugar, orange-juice, and lemon-juice, in the order in which they are given, stir for a moment, and then strain the liquid through a napkin into molds, and set it to cool. Use earthenware or granite-ware molds, not tin. The point most to be observed in making this jelly is getting the juice from the oranges. The most natural way for one to do would be to cut the oranges in halves, and squeeze them in a lemon-squeezer, but that will not do, for the orange-oil of the rind is extracted in such large quantities as to destroy the delicate flavor of the jelly. The proper way to do is to peel the fruit, cut it in pieces, put them in a jelly-bag, and squeeze out the juice with the hand.
 
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