OCTOBER. Illuminating Power Amount of Impurity. in Standard Sperm Candles. Sulphuretted Ammonia per Sulphur per Hydrogen. 100 feet, grains. 100 feet, grains. 1 17.3 None 0.8 16.5 2 16.7 „ 0.2 18.1 3 16.6 „ 0.3 16.2 5 16.4 „ 0.2 15.3 6 16.6 „ 0.1 13.2 7 16.4 „ 0.2 14.1 8 16.3 „ 0.0 17.0 9 16.5 „ 1.0 16.1 10 16.3 „ 0.5 15.6 12 16.3 „ 0.4 16.1 13 16.1 „ 0.2 16.2 14 16.3 „ 0.0 17.1 15 16.7 „ 0.0 17.2 16 16.6 „ 0.0 17.3 17 Not received 19 16.6 „ 0.0 17.5 20 15.5 „ 0.0 17.4 21 16.2 „ 0.6 15.7 22 16.5 „ 0.4 15.7 23 16.4 „ 0.0 16.2 24 16.4 „ 0.0 15.8 26 17.8 traces 0.0 15.4 27 17.4 much 0.0 15.3 28 16.8 trace 0.0 18.4 29 16.3 None 0.0 18.2 30 16.4 „ 0.0 18.2