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might have studied the pictures in my father’s books or in some other book.) If not, can he have got some accomplice to procure the fungus for him? (Not impossible, but unlikely. Country people usually pay little attention to fungi, and the element of risk involved would be very great.) In what way was the dish of fungi cooked? It would be easier to add a foreign substance to a stew, for example, which is done slowly and needs little superintendence, than to a grill or a fry, which takes only a few minutes and is under the cook’s eyes all the time. ( Answer : Munting, speaking from memory, thinks the dish appeared more in the nature of a stew. My father’s letter to me ( No. 15 ) of October 22nd, 1928 , is of interest in this connection.) Note : To ask Sir James Lubbock if he can confirm this. If Lathom was able to recognise and procure Amanita muscaria , could he not have boiled it on some previous occasion and added the poison to the stew in liquid form, so as to run less risk of my father’s recognising the intrusion of the wrong fungus? ( Answer : Very probably.) (As regards the question of Means, therefore, it seemed clear that Lathom might readily have had access to the poison, and that there was no mechanical difficulty at all to prevent his having introduced it into the dish of mushrooms. When, however, we came to consider the subject of Opportunity, we were faced with a more important set of difficulties.) B. Opportunity At what time was the poison actually administered to Harrison? A terminus a quo is provided by the evidence of Harry Trefusis, who saw Harrison alive and apparently well at 10:30 a.m. on Thursday. By this time, Lathom was presumably in the train and on his way to London. The terminus ad quem can be stated with