Study on Xu Xia-ke's travels of the extraordinary cold in the 17th century and the extra long heavy rain in Yunnan Province in 1638

This paper is translated and consolidated from the following papers: Study on Xu Xia-ke's Records of the Extraordinary Cold Caused by the Heavy Snow in the 17th Century (Geographical Research, v. 12, no. 3), and A Study on the Extra Long Autumn Rain in the Central Part of Yunnan in 1638 Based on Xu Xia-ke's Travels (Geographical Research, v. 14, no. 4). The translation and consolidation were done by Wong Yat Loon, Department of Urban and Environment Science, Peking University, Beijing 100871, China This revised version was published online in August 2006 with corrections to the Cover Date.