388 



SMITH. 



In conclusion, I wish to call attention to text fignre 1 wherein I have 

 attempted to show the probable outline of Mindanao in early tertiary 

 times. This is purely tentative. 



Fig. 1. — Probable outline of Mindanao in late Tertiary times (represented by 



diagonal lines). 



APPENDIX. 



By Matteice Goodman. 

 (From the Division of SlineSj Bureau of Science, Manila, P. J.) 



Upon the completion of the reconnaissance from Davao to Butuan, I 

 continued on my way to the mouth of the Tubay Eiver, which empties 

 into the sea at the town of Tubay on the eastern shore of Butuan Bay. 

 The lower part of this river is a raging mountain stream containing 

 numerous rapids, which add no little element of danger to the ordinary 

 difficulties of rowing against a swift current. Near the coast I estimated 

 our headway to be at the rate of about 1,700 meters per hour, but as we 

 approached the junction with the Asiga Eiver further progress was 

 rendered extremely laborious and it was only with the assistance of some 

 friendly Mangwangas that we made any headway whatever. 



