The Hunting of the Snark the illustrations needed three months to be complete. By the time Holiday had completed the sketches and sent them to Carroll, Carroll had already created a new fit requiring an illustration. They worked this way until Holiday had created nine illustrations as well as the front cover and the back cover of the book. Thus, among the ten illustrations shown below, one illustration is not by Henry Holiday. The "Ocean Chart" is typographic art whereas electrotypes made from Joseph Swain's woodblock engravings were used to print Henry Holiday's illustrations. There is no depiction of the Snark, nor of Boots. However,
Lewis Carroll with a bloody nose, which he recorded in his diary and noted that the episode left him not feeling himself for "quite sometime afterward". This attack was diagnosed as possibly "epileptiform" and Carroll himself later wrote of his "seizures" in the same diary. Most of the standard diagnostic tests of today were not available in the nineteenth century. Yvonne Hart, consultant neurologist at the John Radcliffe Hospital, Oxford, considered Dodgson's symptoms. Her conclusion, quoted in Jenny Woolf's 2010 "The Mystery of Lewis Carroll", is that Dodgson very likely had migraine, and may have had epilepsy, but she emphasises that she