Comparing these four groups with the Igorot, we find that the latter averages slightly taller than all but the Ilocano. The breadth of the head is about the same as the Ilocano; but the length is much greater, and there is, in consequence, a considerable difference in the cephalic index. Reference to our tables will show the Ilocano and both Tinguian divisions to be brachycephalic, while the Igorot is mesaticephalic. The average index of the Apayao also falls in the latter classification; but the variation from Igorot is greater than is indicated, for the Apayao skull is actually considerably shorter and narrower. In the length and breadth of the nose, the Igorot exceeds any of the groups studied, while the Malayan (Mongolian?) fold of the eye is reported in the great majority of cases. The bodily appearance of the Tinguian and Bontoc Igorot differs little, although the latter are generally of a slightly heavier build. Both are lithe and well proportioned, their full rounded muscles giving them the appearance of trained athletes; neither is as stocky or heavy set as are the Igorot of Amburayan, Lepanto, and Benguet. There is great variation in color among the members of all these tribes, the tones varying from a light olive brown to a dark reddish brown; but in general the Ilocano and Valley Tinguian are of a lighter hue than the mountain people. Observations on the Southern Chinese and the South Perak Malay are given below, not with the intention of connecting them with any one of the tribes of Luzon, but in order to test, by comparison, the theory of the Chinese origin of the Tinguian, and also to secure, if possible, some clue as to the relationships of both peoples. _The Southern Chinese_ _Dr. Girard_, [33] as a result of his studies on the Chinese of Kwang-si, a province of southern China, expresses the belief that the population is greatly mixed, but all considered they appear more like Indo-Chinese than like the Chinese proper (that is, Northern Chinese). _Deniker_ [34] comes to a similar conclusion from a study of the results obtained by many observers. _Girard_ gives the following measurements for 25 males of Kwang-si: Range Average Height, standing meters 1.528 to 1.748 1.616 Length of head " .1815 Breadth of head " .1435 Height of head " .1270 Length of nose " .04648 Breadth of nose " .03876 Cephalic index 73. to 85. 79.52 Length-Height index 69.9 Breadth-Height index 88.5 Nasal index 67. to 95. 82.98