Photographs, kreatinin by George Stillingfleet Johnson Two photographic negatives showing the structure of kreatinin under the microscope, including 'the spherical mercury salt of kreatinin precipitated from fresh normal human urine'. Subject: Chemistry / Biochemistry Prints of these photographs were published in volume 43 of the Proceedings of the Royal Society alongside the paper 'On kreatinins. I. On the kreatinin of urine as distinguished from that obtained from flesh kreatin. II. On the kreatinins derived from the dehydration of urinary kreatin'. 1887