Until within the last two years there has been no complete record kept in the State Engineer’s office of the casualties among the miners at work on this great undertaking; but a careful examination of the existing records, and of the superintendents at different portions of the work, has enabled us to present the following analysis of the accidents, causing death or injuries to miners, which have occurred within the past three years, and to this we append the accidents by gun-cotton, Erhardt’s powder and fire, which, although of an earlier date, from their peculiar nature have had special memoranda made in regard to them. ANALYSIS. Killed. Injured. Killed and injured by falling rocks, tumbling down Shaft, and the usual casualties of miners other than those mentioned below, 14 12 Fire—Burning Central Shaft, 13 Over-sensitive Exploders, 7 a number. Dualin (about 600 lbs. actually used), 1 3 Erhardt’s Powder (less than 500 lbs. used), 3 10 Gun-Cotton (about 250 lbs. used), 1 4 Nitro-Glycerin (about 150,000 lbs. used), 5 5 Gun-Powder (most of the accidents from powder, occurred at an earlier date than our record, which in this respect is necessarily incomplete), 2 3 ——— ——— 46 37 8 ——— 45 This analysis shows 46 killed, and 45 (allowing 8 as the “number” vaguely mentioned in the records) injured by the various sources of accidents referred to, and as the relation of Nitro-Glycerin to other explosives is what especially interests our readers, the following comparative analysis of the deaths in proportion to the number of pounds of each explosive used at the Hoosac Tunnel, will enable them to form some idea as to the comparative safety of those mentioned. ANALYSIS. Killed. Amount used. Proportion lbs. of deaths per 100 lbs. Erhardt’s Powder, 3 500 .6 Gun-Cotton, 1 250 .4 Dualin, 1 600 .16 Nitro-Glycerin, 5 150,000 .0003