licked him—and showed so much exuberant affection that her master was quite surprised, and asked her:

"'Do you know this gentleman?' To which Ilse replied: 'No!' adding, as though as an after-thought—'Rolf!' She had evidently scented Rolf (who is her father and of whom she is very fond) about my husband's clothes'"

"B. Report on the Dog Heinz

"A second dog, by name Heinz, who came into the possession of Mr. Justice Leser in Mannheim, has proved himself to be an excellent arithmetician, and this without ever having been worried with instruction. In the same way as Rolf he gives two raps for 'yes' and three for 'no,' while four express that he is 'tired.'

"Mr. Justice Leser reports:

"If I ask Heinz whether he will do arithmetic he invariably raps "2," even though sometimes accompanying his assent with a yawn. I am generally obliged to hold out the prospect of some reward as an inducement to do his sums. I should have preferred his rapping against some article one could hold in one's hand, or that he could be induced to "rap out" on a board setting forth the numbers, and which might be placed on the floor before him; but to neither of these alternatives will he agree, having since his earliest youth learnt to rap in the same way as Rolf does. He will, however, not only rap for me, but for any person he knows well, solving such problems as: 3 + 4 - 6, or √121 + 3, or 14/2 + 4, or 3², and he seldom makes a mistake, even when the sum he may be asked merely resembles the form of arithmetic he has learnt. But he generally gives up after two or three sums and is generally distracted. He can read the figures too, and generally gives a correct solution to sums which have been written down for him and which I myself have not read. Like Rolf, he only looks at the paper sideways. He reads very reluctantly. His memory is excellent; especially quick is he at recognizing those persons again who have at any time had to do with him.'

"When I was in Mannheim on 22 March, 1916, Mr. Justice Leser was kind enough to show me the dog. I put some problems to it verbally and was able to satisfy myself as to its abilities in the matter of arithmetic. Of those then put by me I still call to mind the following: '24 ÷ 3 - 3?' Answer: '5,' and '√10,000 - 87?' Answer: '13.'⁹

"C. Report on the Dog Harras

"The third dog, Harras, came into the possession of Fräulein Eva Hoffmann, of Schloss Berwartstein, near Bergzabern, and was instructed by her in spelling and arithmetic with excellent results. This lady sends the following report:

"'From the very beginning his gift for arithmetic was quite remarkable. It was enough to give him an idea of how to reckon, explaining to him the different forms of arithmetic, for the dog to learn to give the right answers to easy sums immediately.

"'Fractions, decimals, cubes and the easier forms of equation, have been set him by a stranger. With some coaching he was also able to master textual problems in this way, giving eager and glad response in the form of "yes" and "no" when it came to questioning him as to his having understood or not understood—liked or not liked the subject. He usually did his sums with evident pleasure and with amazing celerity. Spelling gave him more trouble. He could not even remember an alphabet he had himself put together, and one I invented for him he only memorized after going over it many times. He took no pleasure in putting words together and got tired very soon. Some of his original remarks are that he recognized Sunday by the "dress" I had on; also that he had dreamt of a "cow" (this after having seen one when we were out walking), and so on.

"'Remarkable is his love of truth; should he have done anything that deserves punishment, he approaches me with his head hanging down and a very dejected tail—replying to the question as to whether he deserves a whipping with a reluctant "yes," and to a further enquiry as to whether he is ashamed of himself, he responds with an emphatic "yes—yes—yes!"

"'But as is the case with children, example and precept are of far greater use than corporeal punishment, although this cannot be neglected altogether. The axiom that we evolve in accordance with the treatment meted out to us is as true in the case of an animal as it is with that of a human being, and the more this is recognized and laid to heart the shorter will be the martyrdom still inflicted upon the animal kingdom.'

"In the March of this year Fräulein Hoffmann was kind enough to communicate the following incident to me; it corroborates an earlier observation made by Frau Dr. Moekel (compare 'Communications of the Society for Animal Psychology,' 1914, p. 6, or 'The Soul of an Animal,' 1916, p. 81).

"'I was sitting in the garden reading, when I heard the sound of birds twittering over their food in a tree hard by. Harras watched them attentively for some time and I told him the names of the birds—they were jays and wood-peckers. The next morning he did not come up to my room a second time with the maid, although he can generally hardly contain himself until he has had his breakfast given him. At length, when he did appear, I asked him if he had seen the birds again, and he answered "yes"; then to my question as to their names he gave "her" and "spct" (i.e. "Häher" and "Specht" = jay and woodpecker).'"

"D. Report on the Dog Roland

"Little Roland, who received his first tuition from Frau Dr. Moekel, unfortunately came to an untimely end—owing to an accident.¹⁰ Concerning this, Frau Dr. Moekel wrote to me in March, 1915, as follows:

"'My dear little Roland—whom we called "Guckerl" ( = Peep-eyes), because of his wonderful eyes, has been run over by a motor-car. He suffered terribly for two days and died on 19 March. His death is not only a sorrow to me, but a loss to the interests of the cause we have at heart, for Roland had begun to make the most delightful remarks quite spontaneously. On the last evening before the accident, he came to me and—without having been questioned—rapped out: "Rolf ark bei (s) d arm roland" ( = Rolf has badly bitten poor Roland). I was not able at the time to translate his little utterance, and it was only after his death that I remembered my notes. Then, on putting them together it transpired that Roland had been bitten by Rolf because he had chased Daisy, our kitten.

"'Roland could recognize money, stamps and bank-notes; he could count flowers and bricks, and knew all the various colours and scents as well as count tones, recognize melodies and tell the time.'

"I have not added my report made with reference to Lola to the above, the object of my book being to make the reader acquainted with this dog."

MY PREVIOUS ACQUAINTANCE WITH THE SUBJECT

I cannot remember whether it was in 1912, or earlier, or possibly even later, that I heard for the first time of Karl Krall's horses at Elberfeld. No details then reached me; only just the generalities relative to their ability to count and spell. Of their fore-runner, "der kluge Hans," I had as yet heard nothing. I had been a child when Hans had made his début, so to speak; he had then vanished and the odium which had later attached to his name was, therefore, unknown to me. I may say that I was totally unprejudiced when the news of these horses reached and, indeed, as there was but little information I did not interest myself further about the subject, although it had made a