On Yuan Chwang's Travels in India, 629–645 A.D. v1.c3.9

v1.c3.9

This is, however, only one of two apparently equally correct Chinese forms of writing the first half of the name. The initial sound in the other form of the word is unknown in India and England. Sir Thomas Wade was kind enough to pronounce it for me; and it seems to be nearly the German ch (the palatal, not the guttural,—as in Mädchen) or the Spanish x, only more sibilant. It is really first cousin to the y sound of the other form, being pronounced by a very similar position of the mouth and tongue. If it were represented by the symbol HS (though there is neither a simple h sound nor a simple s sound in it), then a lazy, careless, easy-going HS would tend to fade away into a y.