460 ADAMS. 



found on the I'ailway between 1'avtay ajid Antipolo was of superior 

 quality, and it was judged from tlie geological foi'niation that it would 

 continue in a southerly directioji to Angono, which is on the shore of 

 the lake. At Angono, however, ^lere is a belt of alluvial land lying 

 hetM'een the hills and the lake shore, across which it would be necessary 

 to nse land transportation for a distance of approximately 2 kilometers. 

 It was reported informally to the city engineer that this location would 

 probaljly furnish the best rock available near Manila, and when it was 

 seen that land transportation could not be avoided if a good quality of 

 stone was to be secured, instj-uctions were received to examine the vicinity 

 of Angono. A hill situated to the northeast of the town contains a 

 fine-grained, even-textured gabbroic rock, bi'eaking with a good fracture. 

 Samples of it were secured and tested in the abrasion )iiacliine. It 

 showed 3.17 per cent of wear, and constituted at that time tlie best road 

 material which had l^een received at the laboratory. Although the per- 

 centage of wear is not very much lower than that of the Talim rock, 

 which is 8-.57 per cent, the even quality of the stone and the ^Jossibility 

 of obtaining it ^vithout admixture of quarry dirt and objectionable in- 

 ferior material, such as is found in the ijuarry now operated, renders it 

 far superior to the Talim product. It was learned during the investiga- 

 tion of the Angono locality that under the Spanish regime a (juarry had 

 been opened in the hills to the southeast of Angono, a tramway built to 

 the border of the lake and a stone pier constructed from which the 

 contents of cars could be dumped into scows. All of this installation 

 was abandoned and sold before the American oceupiation and the quarry 

 practically forgotten. Complete records, howe\'er, were disco\-eied in the 

 city archives. Before the location of the quarry had been ^-isited, stone 

 obtained from it was seen in the riprap on Pasig River in front of the 

 municipal building at Pasig. This stone is suitable for many purposes 

 and was used at various places in Manila by the Spanish, Ijut it is 

 brecciated, which uneven texture renders it much less desiralsle for road 

 material than the stone in the hill northeast of Angono. Samples of the 

 rock were selected and submitted to abrasion tests. It showed 2.31 

 per cent of wear on carefully selected pieces and it is probable that the 

 run of the quari'y would not be quite so good. It is unfortunate that 

 the Spanish quarry is not suitable for supplying stone for macadamizing, 

 since the utilization of what remains of the tram grade and the stone 

 pier would save a considerable expense. Steps have been taken l)y the 

 city to secure a title to the new quarry site northeast of Angono, and before 

 long Manila may have better streets. The additional cost of the land 

 transportation will probably be counterbalanced by the saving in main- 

 tenance. 



Stone used on the roads of tJie provinces. — When the abrasion maeliine 

 was installed, and a few samples of stone had been tested, a report of the 



