This is easy; it tells people how they may test any action so as to know what they ought to call it; it leaves well alone by avoiding all such debatable matters as reflex action, consciousness, intelligence, purpose, knowledge of purpose, &c.; it both introduces the feature of inheritance which is the one mainly distinguishing instinctive from so-called intelligent actions, and shows the manner in which these last pass into the first, that is to say, by way of memory and habitual repetition; finally it points the fact that the new generation is not to be looked upon as a new thing, but (as Dr. Erasmus Darwin long since said {61a}) as “a branch or elongation” of the one immediately preceding it. In Mr. Darwin’s case it is hardly possible to exaggerate the waste of time, money and trouble that has been caused, by his not having been content to appear as descending with modification like other people from those who went before him. It will take years to get the evolution theory out of the mess in which Mr. Darwin has left it. He was heir to a discredited truth; he left behind him an accredited fallacy. Mr. Romanes, if he is not stopped in time, will get the theory connecting heredity and memory into just such another muddle as Mr. Darwin has got evolution, for surely the writer who can talk about “_heredity being able to work up_ the faculty of homing into the instinct of migration,” {61b} or of “the principle of (natural) selection combining with that of lapsing intelligence to the formation of a joint result,” {61c} is little likely to depart from the usual methods of scientific procedure with advantage either to himself or any one else. Fortunately Mr. Romanes is not Mr. Darwin, and though he has certainly got Mr. Darwin’s mantle, and got it very much too, it will not on Mr. Romanes’ shoulders hide a good deal that people were not going to observe too closely while Mr. Darwin wore it. I ought to say that the late Mr. Darwin appears himself eventually to have admitted the soundness of the theory connecting heredity and memory. Mr. Romanes quotes a letter written by Mr. Darwin in the last year of his life, in which he speaks of an intelligent action gradually becoming “_instinctive_, _i.e._, _memory transmitted from one generation to another_.” {62a} Briefly, the stages of Mr. Darwin’s opinion upon the subject of hereditary memory are as follows:— 1859. “It would be _the most serious error_ to suppose that the greater number of instincts have been acquired by habit in one generation and transmitted by inheritance to succeeding generations.” {62b} And this more especially applies to the instincts of many ants. 1876. “It would be a _serious error_ to suppose,” &c., as before. {62c} 1881. “We should remember _what a mass of inherited knowledge_ is crowded into the minute brain of a worker ant.” {62d}