This section is from the book "Soyer's Standard Cookery", by Nicolas Soyer. Also available from Amazon: Soyer's Standard Cookery.
Two pounds of soft maple sugar, one cup boiling water, whites of four eggs.
Break sugar in small pieces, put in saucepan with boiling water, and stir occasionally until sugar is dissolved. Boil without stirring until syrup will thread when dropped from tip of spoon. Pour syrup gradually on beaten whites, beating mixture constantly and continue beating until of right consistency to spread.
 
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