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at which very few excel! The paradox finds its explanation, perhaps, in that the master-economist must possess a rare combination of gifts. He must reach a high standard in several different directions and must combine talents not often found together. He must be mathematician, historian, statesman, philosopher-in some degree. He must understand symbols and speak in words. He must contemplate the particular in terms of the general, and touch abstract and concrete in the same flight of thought. He must study the present in the light of the past for the purposes of the future. No part of man's nature or his institutions must lie entirely outside his regard. He must be purposeful and disinterested in a simultaneous mood; as aloof and incorruptible as an artist, yet sometimes as near the earth as a politician. Much, but not all, of this ideal many-sidedness Marshall possessed. But chiefly his mixed training and divided nature furnished him with the most essential and fundamental of the economist's necessary gifts-he was conspicuously historian and mathematician, a dealer in the particular and the general, the temporal and the eternal, at the same time.

III

The task of expounding the development of Marshall's Economics is rendered difficult by the long intervals which generally separated the initial discovery and its oral communication to pupils from the final publication in a book to the world outside. Before attempting this, it will be convenient to trace briefly the outward course of his life from his appointment to a lectureship at St. John's College, Cambridge, in 1868 to his succession to the Chair of Political Economy in Cambridge in 1885.

For nine years Marshall remained Fellow and Lecturer of St. John's, laying the foundations of his subject but publishing nothing. After his introduction to the Grote Club he was particularly intimate with W. K. Clifford 2 and Fletcher Moulton. Clifford was chief favourite, though "he was too fond of astonishing people." As a member, a little later on, of the "Eranus" he was in touch with Sidgwick, Venn, Fawcett, Henry Jackson and other leaders of that first age of the emancipation of Cambridge.

1 The occasional articles belonging to this period are included in the Bibliography below.

2 Clifford, who was three years Marshall's junior, came up to Trinity in 1863, was elected to a Fellowship in 1868, and resided in Cambridge, where his rooms were the meeting point of a numerous body of friends" (vide Sir F. Pollock's Memoir), until 1871.

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At this time he used to go abroad almost every long vacation. Mrs. Marshall writes:

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"He took with him £601 and a knapsack, and spent most of the time walking in the high Alps. This walking, summer after summer, turned him from a weak into a strong man. He left Cambridge early in June jaded and overworked and returned in October brown and strong and upright. Carrying the knapsack pulled him upright, and until he was over eighty he remained so. He even then exerted himself almost painfully to hold himself straight. When walking in the Alps his practice was to get up at six and to be well on his way before eight. He would walk with knapsack on his back for two or three hours. He would then sit down, sometimes on a glacier, and have a long pull at some book-Goethe or Hegel or Kant or Herbert Spencer-and then walk on to his next haltingplace for the night. This was in his philosophic stage. Later on he worked out his theories of Domestic and Foreign Trade in these walks. A large box of books, etc., was sent on from one stage to another, but he would go for a week or more just with a knapsack. He would wash his shirt by holding it in a fast-running stream and dry it by carrying it on his alpenstock over his shoulder. He did most of his hardest thinking in these solitary Alpine walks.

"These Wanderjahre gave him a love for the Alps which he always retained, and even in 1920 (for the last time) we went to the South Tyrol, where he sat and worked in the high air.

"Alfred always did his best work in the open air. When he became Fellow of St. John's he did his chief thinking between 10 a.m. and 2 p.m. and between 10 p.m. and 2 a.m. He had a monopoly of the Wilderness in the daytime and of the New Court Cloisters at night. At Palermo in the early eighties he worked on the roof of a quiet hotel, using the cover of the bath as an awning. At Oxford he made a 'Den' in the garden in which he wrote. At Cambridge he worked in the balcony, and later in a large revolving shelter, fitted up as a study, called 'The Ark,' and in the Tyrol he arranged a heap of stones, a camp stool and an air cushion into what he called a throne,' and in later years we always carried a tent shelter with us, in which he spent the day."

In 1875 Marshall visited the United States for four months.

1 He used to reckon that his necessary expenditure as a bachelor Fellow amounted to £300 a year, including £60 for vacation travel.

He toured the whole of the East, and travelled as far as San Francisco. At Harvard and Yale he had long talks with the academic economists, and he had many introductions everywhere to leading citizens. But his chief purpose was the "study of the Problem of Protection in a New Country." About this he inquired on all hands, and towards the end of his trip was able to write in a letter home: "In Philadelphia I spent many hours in conversation with the leading protectionists. And now I think, as soon as I have read some books they have recommended me to read, I shall really know the whole of their case; and I do not believe there is or ever has been another Englishman who could say the same."

On his return to England he read a paper at the Cambridge Moral Science Club on American Industry, Nov. 17, 1875, and later on he lectured at Bristol, in 1878, on "The Economic Condition of America." The American trip made on him a great impression, which coloured all his future work. He used to say that it was not so much what he actually learnt, as that he got to know what things he wanted to learn; that he was taught to see things in proportion; and that he was enabled to expect the coming supremacy of the United States, to know its causes and the directions it would take.

Meanwhile he had been helping Fawcett, who was Professor, and Henry Sidgwick, to establish Political Economy as a serious study in the University of Cambridge. Two of his earliest pupils, H. S. Foxwell and, later on, my father, John Neville Keynes, who took the Moral Sciences Tripos in 1875, joined these three as lecturers on Political Economy in the University.

In 1876 Alfred Marshall became engaged to Miss Mary Paley, a great-granddaughter of the famous Archdeacon. Miss Paley was a former pupil of his and was a lecturer in Economics at Newnham. His first book, Economics of Industry, published in 1879, was written in collaboration with her; indeed it had been, at the start, her book and not his, having been undertaken by her at the request of a group of Cambridge University Extension lecturers. They were married in 1877. During forty-seven years of married life his dependence upon her devotion was complete. Her life was given to him and to his work with a

1 Miss Paley was one of the small band of five pioneers who, before the foundation of Newnham College, came into residence under Miss Clough in 1871 at 74 Regent Street, which had been taken and furnished for the purpose by Henry Sidgwick. She and Miss Bulley, taking the Moral Sciences Tripos in 1874 as Students of the "Association for Promoting the Higher Education of Women in Cambridge," were the first of the group to take honours at Cambridge.

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