The Art of Paper-Making / A Practical Handbook of the Manufacture of Paper from Rags, Esparto, Straw, and Other Fibrous Materials, Including the Manufacture of Pulp from Wood Fibre

by Alexander Watt

[21] Sometimes also called thiosulphite of soda.

[22] "The Art of Soap-making." By Alexander Watt. London, Crosby Lockwood and Son, 4th edition, 1890.

[23] Sometimes called "concentrated alum," "pearl alum," etc.

[24] Muspratt's "Chemistry Applied to the Arts."

[25] "Art of Leather Manufacture." By Alexander Watt. Crosby Lockwood and Son, 1885.

[26] "Proceedings of the Society of Civil Engineers," vol. lxxix. p. 245.

[27] Paper-Makers' Monthly Journal, April 15th, 1889.

[28] The berries of Rhamnus catharticus made into a decoction by boiling.

[29] Paper Trade Journal, New York, April 20th, 1889.

[30] Sanitary World, March 29th, 1884.