Just twenty. seven years ago Ⅰ started my geological-investigations of North Manchuria in connection with the construction of the Chinese Eastern Railway, on behalf of the Board of Directors of the said Railway and the Russian Geographical Society. Just twenty. Seven years ago Ⅰ started my geological-investigations of North Manchuria in connection with the construction of the Chinese Eastern Railway, on behalf of the Board of Directors of the said Railway and the Russian Geographical Society.