=944.= The manner of Demoivre’s death has a certain interest for psychologists. Shortly before it, he declared that it was necessary for him to sleep some ten minutes or a quarter of an hour longer each day than the preceding one: the day after he had thus reached a total of something over twenty-three hours he slept up to the limit of twenty-four hours, and then died in his sleep.--BALL, W. W. R. _History of Mathematics (London, 1911), p. 394._ =945.= De Morgan was explaining to an actuary what was the chance that a certain proportion of some group of people would at the end of a given time be alive; and quoted the actuarial formula, involving π, which, in answer to a question, he explained stood for the ratio of the circumference of a circle to its diameter. His acquaintance, who had so far listened to the explanation with interest, interrupted him and exclaimed, “My dear friend, that must be a delusion, what can a circle have to do with the number of people alive at a given time?” --BALL, W. W. R. _Mathematical Recreations and Problems (London, 1896), p. 180; See also De Morgan’s Budget of Paradoxes (London, 1872), p. 172._ =946.= A few days afterwards, I went to him [the same actuary referred to in 945] and very gravely told him that I had discovered the law of human mortality in the Carlisle Table, of which he thought very highly. I told him that the law was involved in this circumstance. Take the table of the expectation of life, choose any age, take its expectation and make the nearest integer a new age, do the same with that, and so on; begin at what age you like, you are sure to end at the place where the age past is equal, or most nearly equal, to the expectation to come. “You don’t mean that this always happens?”--“Try it.” He did try, again and again; and found it as I said. “This is, indeed, a curious thing; this _is_ a discovery!” I might have sent him about trumpeting the law of life: but I contented myself with informing him that the same thing would happen with any table whatsoever in which the first column goes up and the second goes down;....--DE MORGAN, A. _Budget of Paradoxes (London, 1872), p. 172._ =947.= [De Morgan relates that some person had made up 800 anagrams on his name, of which he had seen about 650. Commenting on these he says:] Two of these I have joined in the title-page: [Ut agendo surgamus arguendo gustamus.] A few of the others are personal remarks. Great gun! do us a sum! is a sneer at my pursuit; but, / n | u Go! great sum! | a du / is more dignified....