Early in the autumn of 1867 my brother and I, with his family, were settled at St. Petersburg. I entered the university, and sat on the benches among young men, almost boys, much younger than myself. What I so longed for five years before was accomplished,-I could study; and, acting upon the idea that a thorough training in mathematics is the only solid basis for all subsequent work and thought, I joined the physico-mathematical faculty in its mathematical section. My brother entered the military academy for jurisprudence, whilst I entirely gave up military service, to the great dissatisfaction of my father, who hated the very sight of a civilian dress. We both had now to rely entirely upon ourselves.

Study at the university and scientific work absorbed all my time for the next five years. A student of the mathematical faculty has, of course, very much to do, but my previous studies in higher mathematics permitted me to devote part of my time to geography; and, moreover, I had not lost in Siberia the habit of hard work.

The report of rny last expedition was in print; but in the meantime a vast problem rose before me. The journeys that I had made in Siberia had convinced me that the mountains which at that time were drawn on the maps of Northern Asia were mostly fantastic, and gave no idea whatever of the structure of the country. The great plateaus which are so prominent a feature of Asia were not even suspected by those who drew the maps. Instead of them, several great ridges, such as, for instance, the eastern portion of the Stanovói, which used to be drawn on the maps as a black worm creeping eastward, had grown up in the topographic bureaus, contrary to the indications and even to the sketches of such explorers as L. Schwartz. These ridges have no existence in nature. The heads of the rivers which flow toward the Arctic Ocean on the one side, and toward the Pacific on the other, lie intermingled on the surface of a vast plateau; they rise in the same marshes. But, in the European topographer's imagination the highest mountain ridges must run along the chief water-partings, and the topographers had drawn there the highest Alps, of which there is no trace in reality. Many such imaginary mountains were made to intersect the maps of Northern Asia in all directions.

To discover the true leading principles in the disposition of the mountains of Asia--the harmony of mountain formation--now became a question which for years absorbed my attention. For a considerable time the old maps, and still more the generalizations of Alexander von Humboldt, who, after a long study of Chinese sources, had covered Asia with a network of mountains running along the meridians and parallels, hampered me in my researches, until at last I saw that even Humboldt's generalizations, stimulating though they had been, did not agree with the facts.

Beginning, then, with the beginning, in a purely inductive way, I collected all the barometrical observations of previous travelers, and from them calculated hundreds of altitudes; I marked on a large scale map all geological and physical observations that had been made by different travelers,--the facts, not the hypotheses; and I tried to find out what structural lines would answer best to the observed realities. This preparatory work took me more than two years; and then followed months of intense thought, in order to find out what all the bewildering chaos of scattered observations meant, until one day, all of a sudden, the whole became clear and comprehensible, as if it were illuminated with a flash of light. The main structural lines of Asia are not north and south, or west and east; they are from the southwest to the northeast,-just as, in the Rocky Mountains and the plateaus of America, the lines are northwest to southeast; only secondary ridges shoot out northwest. Moreover, the mountains of Asia are not bundles of independent ridges, like the Alps, but are subordinated to an immense plateau, an old continent which once pointed toward Behring Strait. High border ridges have towered up along its fringes, and in the course of ages, terraces, formed by later sediments, have emerged from the sea, thus adding on both sides to the width of that primitive backbone of Asia.

There are not many joys in human life equal to the joy of the sudden birth of a generalization, illuminating the mind after a long period of patient research. What has seemed for years so chaotic, so contradictory, and so problematic takes at once its proper position within an harmonious whole. Out of a wild confusion of facts and from behind the fog of guesses,--contradicted almost as soon as they are born,--a stately picture makes its appearance, like an Alpine chain suddenly emerging in all its grandeur from the mists which concealed it the moment before, glittering under the rays of the sun in all its simplicity and variety, in all its mightiness and beauty. And when the generalization is put to a test, by applying it to hundreds of separate facts which had seemed to be hopelessly contradictory the moment before, each of them assumes its due position, increasing the impressiveness of the picture, accentuating some characteristic outline, or adding an unsuspected detail full of meaning. The generalization gains in strength and extent; its foundations grow in width and solidity; while in the distance, through the far-off mist on the horizon, the eye detects the outlines of new and still wider generalizations.

He who has once in his life experienced this joy of scientific creation will never forget it; he will be longing to renew it; and he cannot but feel with pain that this sort of happiness is the lot of so few of us, while so many could also live through it,--on a small or on a grand scale,--if scientific methods and leisure were not limited to a handful of men.

This work I consider my chief contribution to science. My first intention was to produce a bulky volume, in which the new ideas about the mountains and plateaus of Northern Asia should be supported by a detailed examination of each separate region; but in 1873, when I saw that I should soon be arrested, I only prepared a map which embodied my views and wrote an explanatory paper. Both were published by the Geographical Society, under the supervision of my brother, while I was already in the fortress of St. Peter and St. Paul. Petermann, who was then preparing a map of Asia, and knew my preliminary work, adopted my scheme for his map, and it has been accepted since by most cartographers. The map of Asia, as it is now understood, explains, I believe, the main physical features of the great continent, as well as the distribution of its climates, faunas, and floras, and even its history. It reveals, also, as I was able to see during my last journey to America, striking analogies between the structure and the geological growth of the two continents of the northern hemisphere. Very few cartographers could say now whence all these changes in the map of Asia have come; but in science it is better that new ideas should make their way independently of any name attached to them. The errors, which are unavoidable in a first generalization, are easier to rectify.

(Source: Memoirs of a Revolutionist, First Edition, Houghton Mifflin Company, Boston and New York, 1899.)