--------------+--------------+-------------- |Mean result of|Mean Strength Hours. | Readings. |of the Paper. | Lbs. | Lbs. --------------+--------------+-------------- 8 | a 14·1 | 12·1 | b 10·1 | 10 | a 15·4 | 13·2 | b 10·9 | 19 | a 16·5 | 14·0 | b 11·4 | 21 | a 15·2 | 14·0 | b 12·8 | 33 | a 13·4 | 12·4 | b 11·4 | 35 | a 14·5 | 13·6 | b 12·7 | --------------+--------------+-------------- TESTS FOR STRENGTH ON PAPERS, SIZED ONLY. --------------+--------------+-------------- |Mean result of|Mean Strength Hours. | Readings. |of the Paper. | Lbs. | Lbs. --------------+--------------+-------------- 8 | a 22·7 | 20·0 | b 17·3 | 10 | a 28·5 | 23·2 | b 18·0 | 19 | a 22·5 | 21·0 | b 19·5 | 21 | a 26·0 | 21·7 | b 17·5 | 33 | a 15·0 | 15·0 | b 15·0 | 35 | a 14·2 | 15·3 | b 16·5 | --------------+--------------+-------------- TESTS FOR STRENGTH ON PAPER SIZED AND GLAZED. --------------+--------------+-------------- |Mean result of|Mean Strength Hours. | Readings. |of the Paper. | Lbs. | Lbs. --------------+--------------+-------------- 8 | a 25·8 | 23·6 | b 21·4 | 10 | a 28·4 | 23·6 | b 18·9 | 19 | a 27·0 | 22·9 | b 18·9 | 21 | a 24·9 | 22·7 | b 20·6 | 33 | a 16·1 | 15·2 | b 14·4 | 35 | a 17·5 | 16·2 | b 15·0 | --------------+--------------+-------------- It may also be noticed that the strength of the finished paper after twenty hours' beating, as in class B, is equal to that of the paper after nine hours' beating, as in class A. This is curious, especially in view of the fact that the percentage of gelatine in the papers of class B. is only 4·4 per cent. as against 6·0 per cent. in class A.