Peckham and Linton — Trinidad Pitch. 201 



viz : 66*5 per cent and 66*544 per cent. Again, No. 17 was 

 broken off a piece of pitch as a negro raised it and threw it 

 into a tram car. It fell under his feet and was secured as a 

 piece of convenient size for a specimen. On analysis it gave 

 34 2 per cent soluble in petroleum ether, while the total 

 bitumen was 52*997 per cent. These results give 64*531 per 

 cent of the total bitumen soluble in petroleum ether and 

 89*372 per cent soluble in boiling spirits of turpentine. 

 Of the five samples of commercial land piich, Nos. 2, 4 

 and 10 contain 33*62, 33*736 and 33*730 per cent of matter 

 soluble in petroleum ether. The average is 33*705, yet 

 the average per cent of the total bitumen present soluble in 

 petroleum ether is 61*283 per cent, almost identically the 

 same as that yielded by No. 17. In fact No. 2 and No. 

 17 represent the extremes of location from the west side 

 of the tramway to the village lot furthest from the lake and 

 the difference in the percentage of the total amount of bitumen 

 soluble in petroleum ether is only (*255 per cent) two hundred 

 and fifty-five thousandths of one per cent — a difference wholly 

 without significance. No. 9 was from the center of the lake 

 and No. 1 from a village lot about 20 rods nearer the lake than 

 No. 2, yet the difference in the amount of total bitumen 

 present soluble only in petroleum ether, is only forty-four thou- 

 sandths of one per cent. Arranged in a table these samples of 

 commercial pitch appear as follows : 



No. 1. Land__ 66*500 



No. 9. Lake (center) 66*544 



No 4 V Land "-- 



No!l0.') Avera S e 64 ' 283 



No. 17. Lake _.. 64*531 



Of the specimens representing the pitch filling the annular 

 space outside the tramway and beyond, to the boundaries of 

 the lake, Nos. 21 and 22 were taken from the bottom of an 

 excavation on the right of the left limb of the tramway loop 

 as it descends upon the lake and within 140 feet of each other. 

 Nos. 23 and 25 were taken from points very near each other 

 on the right or west side, of the right limb of the tramway 

 loop. These four points are on the north side of the lake and 

 near the border. No. 16 was taken from a point on the south- 

 east side of the lake about half way from the tramway to the 

 border of the lake. The spot was free from grass, yet it was 

 within the area covered with vegetation. Nos. 24 and 26 

 were from points on the south side of the lake directly 

 opposite Nos. 21, 22, 23 and 25 and about 100 feet apart. 



