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 Jacob Thomas John Jacob Thomas John Jacob Thomas, who published as J. J. Thomas (1841 – 1889) was a Trinidadian linguist and writer. He wrote a grammar of Trinidadian Creole (1869), but is best known for "Froudacity" (1889), a rebuttal of J. A. Froude's 1888 book "The English in the West Indies". John Jacob Thomas was born into poverty in South Trinidad in the year 1841 — a couple of years after the Enslaved African period was over in the British West Indies. As a child, he grew up around those who knew what servitude was like and who longed for freedom.