But he could not extricate himself from litigation; the insolvent assignee, the United States Blasting Oil Company, clearly perceiving that the monopoly, as they had termed it, was gone, now resorted to the “pis aller” of litigation, misrepresentation, and threatening every one who used Mowbray’s Nitro-Glycerin, with the trouble of making affidavits, engaging counsel, and collecting evidence, a by no means to be despised aggressive warfare to contractors, who need all their time, all their capital, and all their ingenuity, to carry out their contracts to a profitable result. Guaranteeing the payment of enforced damages, I met this flank movement by engaging the best counsel, and resolutely set about terminating the pretensions of these patents. A Suit in Equity was commenced in the Circuit Court of the United States, Western District of Pennsylvania, during the May Term, 1870, by the UNITED STATES BLASTING OIL COMPANY OF NEW YORK, BY ITS PRESIDENT, TAL. P. SHAFFNER, _vs._ GEO. M. MOWBRAY, J. H. KING, CHAS. LOBB, W. L. HOLBROOK, JAMES DICKEY AND A. D. HATFIELD. As the sworn affidavits in the above case, now pending, are of great importance in substantiating, both practically and legally, the claims urged in previous observations, on behalf of the “Mowbray system” of manufacturing and using Nitro-Glycerin, I give below the substance of the testimony. Evidence of George F. Barker, Professor of Physiological Chemistry and Toxicology in the Medical Department of Yale College. “I have carefully examined the several re-issued patents, Nos. 3,377, 3,378, 3,379, 3,380, 3,381 and 3,382, the four former being divisions A, B, C and D, of the re-issued patent, granted upon the surrender of the original patent No. 50,617, dated October 24th, 1865, and the two latter divisions 1 and 2 of the original patent, also granted to the assignees of Alfred Nobel, on surrender of the original patent No. 57,175, dated August 14th, 1866, granted to said Alfred Nobel. I would further state that in the specifications of the before-mentioned re-issues it is asserted that Sobrero discovered that Glycerin was capable of giving, when, mixed with sulphuric and nitric acids, a substance analogous to gun cotton, which is true; and that the specifications of the said patents further state that “Sobrero abandoned further research with the declared opinion that its combustion or explosion could not be managed”; which statement, having read all which Sobrero is believed to have published upon the subject, viz.: his papers published in the Comptes Rendus de L’Academie des Sciences, Volume XXIV., page 247, printed in Paris A. D. 1847, and in the Repertoire de Chimie Applique, Volume II., page 400, printed in Paris in 1860, I have entirely failed to find recorded by him as his opinion.”