John Jacob Abel to successfully isolate the neutral base of epinephrine by adding ammonium to highly concentrated extract, a method Abel himself tried but failed due to the use of low concentration of extract. After Takamine's success, Abel himself remarked, with great candor, "The efforts of years on my part in this once mysterious field of suprarenal, medullary biochemistry, marred by blunders as they were, eventuated, then, in the isolation of the hormone not in the form of the free base but in that of its monobenzoyl derivative." Together with L.G. Rowntree and B.B. Turner, Abel devised what they called a "vividiffusion" apparatus,
John Abel of the architecture was different from Abel's. Though historical records clearly show otherwise, legend states that Abel found, felled and used all the timber used in Fore Abbey Church in less than five months. In spite of a lack of evidence that he had a hand in the architecture, John Abel was associated with buildings in: Weobley, Abbey Dore, Tyberton, Stretford, Orleton, Pembridge, Ross-on-Wye, Ledbury and Hereford. Abel died in January 1675 and was buried at Sarnesfield on 31 January. He was 97 years old. He wrote his own epitaph and built his own tomb. His tombstone read: In the