Ring was implacable, the more so, perhaps, as Walker and his friends were apparently indifferent to his abuse. He burst forth afresh in the _London Medical Repository_ for 1821, where among much else we find the following-- HANOVER STREET, _11th October, 1821_. The mock Royal Jennerian Society is extending its impositions and depredations. The emissaries of this bastard institution, as well as the principals, should suffer transportation if there be any public spirit among us. I beg leave to add that the present Society is disclaimed by Dr. Jenner, who cautioned the Emperor of Russia against it when his Majesty was in London in 1814. In my _Caution against Vaccine Swindlers and Imposters_, published in 1816, I related several instances of the ill effects of Dr. Walker’s practice, and some in which it had proved fatal. It was partly for his mal-practice, and partly for his mis-conduct, that he was about to be expelled from the Royal Jennerian Society; and, after his artful and wicked stratagems, was permitted to resign; yet now he has the arrogance to call himself Director of that Society, and to issue his venal diplomas in its name. If Dr. Walker must imitate the universities of St. Andrews and Aberdeen, let him at least have like them _some_ certificate of qualification. If he is determined _to grow rich by degrees_, let him also endeavour to grow wise and honest. The diplomas which thus moved Ring’s wrath were imposing documents, certifying that the holder was authorised to vaccinate, intended to be framed and exhibited in the shop or parlour. There was a picture of something like an arch of Waterloo Bridge with London in the background and the Royal Arms overhead; Jenner standing on a pier with a dead serpent hanging in limp folds over his arm, with the inscription, _Per omnia littora vincitur variola_; a woman milking a cow with a group of children around her, drinking milk out of porringers, as if milk were cowpox; whilst the bed of the Thames was blocked with the names of the great and good who had testified in favour of vaccination--an allegorical style of representation then much in vogue and considered impressive.