A size to coat over "hot walls" for the reception of the kalsomine is made by using shellac, 1 part; sal soda, 1/2 part. Put these ingredients in J gallon of water and dissolve by steady heat. Another size is made of glue size prepared in the usual way, and alum. To J pound of white glue add 3/4 pound of alum, dissolving the alum in hot water before adding it to the glue size.