"In that case you must say," he observed, "'How beautiful is the sky!'" Upon thinking this over, says Ibn Khallikan, Abu 'l-Aswad invented the art of grammar. Abu 'l-Aswad Ad-Duwali thus is the father of this book, for had there been no grammarians I am sure that Ibn Khallikan would never have written it. Poetry tickled him; but grammar was his chief delight, as it was the chief delight of all his friends and, one gathers, of all Baghdad. Here is an example: "Al-Mamun, having asked Al-Yazidi about something, received from him this answer: 'No; and may God accept my life as a ransom for yours, Commander of the Faithful!' "'Well said!' exclaimed the khalif. 'Never was the word _and_ better placed than in the praise which you have just uttered.'" He then made him a present. We get an insight both into the passion for the new science of grammar and what might be called the physical humour of the East in this anecdote. Abu Safwan Khalid Ibn Safwan, a member of the tribe of Tamim, was celebrated as an eloquent speaker. He used to visit Bilal Ibn Abi Burda and converse with him, but his language was frequently ungrammatical. This grew at length so irksome that Bilal said to him: "O Khalid! you make me narrations fit for khalifs to hear, but you commit as many faults against grammar as the women who carry water in the streets." Stung with this reproach, Khalid went to learn grammar at the mosque, and some time after lost his sight. From that period, whenever Bilal rode by in state, he used to ask who it was, and on being answered that it was the Emir, he would say: "There goes a summer-cloud, soon to be dispelled." When this was told to Bilal, he exclaimed: "By Allah! it shall not be dispelled till he get a full shower from it;" and he then ordered him a whipping of two hundred strokes. When books were so few and most learning came through the ear, memory had to be cultivated. The Traditionist, Ibn Rahwaih, was a Macaulay in his way. "I know," he used to say, "by heart seventy thousand traditions; I have read one hundred thousand, and can recollect in what work each is to be found. I never heard anything once without learning it by heart, nor learned anything by heart which I afterwards forgot." The sittings of the teacher, Ibn Al-Aarabi (767-846), who knew by heart more poetry than any man ever seen, were crowded by people anxious for instruction. Abu 'l-Abbas Thalah said: "I attended the sittings held by Ibn Al-Aarabi, and saw there upwards of one hundred persons, some asking him questions and others reading to him; he answered every question without consulting a book. I followed his lessons upwards of ten years, and I never saw him with a book in his hand; and yet he dictated to his pupils camel-loads of philological information."