One of two. Cornish, 9 years old, 22ft. long, 6ft. diameter. Tube 3ft. diameter, 3/8 inch plates, 40 lbs. pressure. Gave way at mid-feather wall where corroded to 1/32 inch, at a place where flues were too narrow to enter. Two rings of plates were torn out and blown into an adjoining street, while the reaction of the escaping contents forced the boiler into a building in a very singular manner, doing very great damage. This case is of peculiar interest, because although the cause of explosion was so plain to see, all the old theories of decomposition of steam, and ignition of hydrogen, were revived, and it was even stated that "a bad boiler could not explode, as the corroded part would give way, and allow the steam to escape harmlessly," and any cause seemed to be considered more probable than the plain and simple one, that it was corroded to the thickness of card board. Like many other examples this explosion shows that however well a boiler is tended, it should be examined in the flues to make sure that it is safe. _No. 13. Manchester. March 30th. 2 killed, 3 injured._ Underground. Some alterations were being done to some brick arching, which fell upon and broke steam pipes, and the escape of steam suffocated those near. _No. 14. Warrington. (Fig. 13.) April 13th. 6 killed, 3 injured._ [Illustration: _Fig. 13._] Lancashire, used for evaporation only, 24ft. 6in. long, 8ft. diameter, 3/8 inch plates, and usually worked with little or no pressure. The boiler was very old and much patched, and incapable of bearing the 15 lbs. pressure which was temporarily put upon it. _No. 15. Scotland. April 18th. none injured._ Plain cylinder, said to have exploded from shortness of water, but no particulars have been obtained. _No. 16. Cornwall. (Fig. 14.) April 18th. 1 killed, 1 injured._ [Illustration: _Fig. 14._] One of two. Cornish, very old, 34ft. long, 6ft. diameter. Tube 3ft. 10in. diameter, 3/8 inch plates, 50 lbs. pressure. The tube collapsed and the front part was blown out, and the boiler was forced back a little. It was said to have been short of water, but the weakness of a tube of such large diameter was most likely the true cause. _No. 17. Wellington. (Fig. 15.) April 22nd. none injured._ [Illustration: _Fig. 15._] One of two. Balloon, very old, 11ft. high, 9ft. 6in. diameter, 3/8 inch plates, 5 lbs. pressure. The bottom was corroded externally to 1/8 inch, and temporarily repaired with screw patches, and was so reduced in strength that it gave way at the ordinary pressure. The top was blown about 20 yards away, but little damage was done. _No. 18. Cornwall. May. none injured._ Cornish, 30ft. long, 6ft. diameter. Tube 3ft. 6in. diameter, 40 lbs. pressure. Boiler gave way under bottom where corroded very thin, but little damage was done. _No. 19. Darlaston. (Fig. 16.) May. none injured._ [Illustration: _Fig. 16._]