484 iCKis. 



and a skilk't for frying bacon. At night the men fonstriu-tiM.l a slielter 

 witli palm leaves; the leaves of the analmo palm also served for buckets, 

 cups and plates. The food consisted of rice, canned corned beef, a little 

 bacon, and fi.sh caught in tlie river. 



A rajiid survey of the route was made with a pocket conijjass and an 

 aneroid barometer, the distances being paced or estimated. Only two 

 and one-half days were occupied in making the trip, so that the sui-rey 

 and the geologic notes were taken necessarily very hastily and tliere was 

 little time available for collecting specimens. However, as the bed of 

 the Agos affords an excellent cross-sectional view of the rock formations 

 over a little-known portion of Lu.zon, and since published maps of the 

 interior -were found to be incorrect, it is thought that these notes may be 

 of both geologic and geographic interest. (See Plate I.) Petrographic 

 sections of many of the rocks collected have been made since in this 

 Bureau and have- been examined microscopically by Warren D. Smith, 

 chief of this division. 



The last habitation observed on the banks of the Agos Eiver was 

 estimated to be about 5 miles from its mouth, and the only people en- 

 countered until we were within a few miles of Tanay were some Negrito 

 fishermen and one family of Filipinos fishing along the headwaters of 

 Alasasin Creek. The Negritos fished in the large stream with spear and 

 bow and arrow, while the Filipinos killed their fish by throwing into 

 the small creeks a poison obtained from certain trees. Fish of excellent 

 quality abound in the waters of the Agos, some that were speared by 

 the guides being 20 inches in length. One crocodile, some 5 feet in 

 length, was observed and crocodile trails were seen frequently in the sand. 



A short distance above the Macadata Eiver Corporal Bromio shot a 

 large eagle which was identified subsequently by Mr. E. C. McGregor, 

 of this Bureau, as the rare Philippine eagle Pithecophaga jefferyi. which 

 has heretofore been suspected but not positively known to inhabit Luzon. 



Published maps of this area show the Agos Eiver as little more than 

 a creek a few miles in lengtli, while most of them indicate a much larger 

 stream called the Tiauan or sometimes the Bio Grande de Lampon, 

 draining the interior between Infanta and Montalon. As will be seen 

 by a reference to the route map, the Agos was found to be one of the 

 largest rivers on the east coast of Luzon, having an extensive watershed 

 in the Eastern Cordillera. The Tiauan, therefore, does not extend as far 

 north as the town of Infanta. 



In the office of the United States Coast and Geodetic Survey in Manila, 

 there is a tracing of a map ;\-hich represents the Agos Eiver as an im- 

 portant stream, but this map is far from correct. The tracing is from 

 an unpulilished map in Madrid, presumably by d' Almonte, and was ob- 

 tained by Mr. Putnam, formerly in charge of the Manila office of the 

 United States Coast and Geodetic Survey. Sheet No. 39 of the Progres- 



