As has already been said, while still a youth Kropotkin went to Siberia to aid Kukel improve the prisons, the exile system, etc. But when the Herzen-reading Kukel was recalled, and it was no longer permitted to mention the word "reform," Kropotkin became an explorer. Being clever, he soon made several important discoveries--the border-ridge of the Khingan, the tertiary volcanoes of the Uyun Kholdonsti, a direct route to the Amur. Also it is interesting to remember that he was among the first Europeans who entered Manchuria,[10] and he went at the risk of being put in a cage and conveyed across the Gobi on a camel's back. It was impossible to go as an officer, so Kropotkin disguised himself as a trader, put on a long blue cotton dress, and acted like a Muscovite merchant--sitting on the edge of the chair, pouring his tea in the saucer, blowing on it with puffed-out cheeks and staring eyes, and nibbling tiny particles from his lump of sugar. One night as he wandered thru a Chinese town, the inhabitants by signs asked him why such a young man wore a beard. Answering by the same means, Kropotkin told them that if he had nothing else to eat he could eat the beard. This caused the Celestials to roar with laughter, and they petted him tenderly, showed him their houses, and offered him more pipes than Skitaletz's Gavril Petrovitch could have smoked. In 1866, Kropotkin found what previous explorers had vainly sought--a communication between the gold mines of Yakutsk and Transbaikalia. Then came what he considers his chief contribution to science: the important discovery that the maps of Northern Asia were incorrect, because the main lines of structure run neither north and south, nor east and west, but from the southwest to the northeast.[11] Later Kropotkin was to lead an expedition to the Arctic seas, but as the government was spending enormous sums in erecting scaffolds, it could not spare a poltinik for explorations in unknown regions. However the Geographical Society sent him to Finland to study the glacial deposits. Here he made valuable researches relative to the glaciation of the country. He conceived the idea of writing a monumental physical geography of Northern Europe. His chief ambition was to become the Secretary of the Society, for then he would be in a condition to considerably advance the cause of science.