20 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 65 



as well as the sequence of acid and basic igneous rocks and the 

 complex interrelations of extensive garnet gneisses, amphibolites, 

 and other Grenville and post-Grenville crystalline formations. 



EXPEDITION TO BORNEO AND CELEBES 

 Mr. H. C. Raven, who, through the generosity of Dr. W. L. 

 Abbott, has been working in Borneo since the summer of 1912, 



Fig. 19. — The " Bintang Kumala," used by Mr. Raven in Borneo from July, 

 1912 to July, 1914. Photograph by Raven. 



continued his explorations, with Samarinda, Dutch East Borneo, as 

 headquarters. During the early part of the year he worked on the 

 coast north of Samarinda, and later he ascended the Mahakam River. 

 The results were satisfactory, though the region of the upper 

 Mahakam proved somewhat disappointing on account of the prac- 

 tical extermination by the natives of all mammals large enough to 

 be used as food. About the middle of July Mr. Raven finished his 

 Bornean exploration and crossed the Macassar Strait to the Island 



