181 



streets, show at 15 feet from the surface a black streak 2 inches thick, the 

 whole mass being gravel as far as they have yet gone. 



]\Ir. Blodgct recounted the experience of those who laid the foundations 

 of the Masonic Temple, Broad and Filbert, where two gravels were found 

 separated by 3 feet of quicksand, which required two powerful steam 

 pumps 6" and 8" working night and day. The top of the quicksand layer 

 was accidentally uncovered at the corner of the lot 40 feet deep, and this 

 obliged the plan for laying the foundation to be entirely changed at an 

 expense of say $30,000. 



The great tower of the Pu1)lic Buildings opposite to the Masonic Tem- 

 ple, has its foundation laid in the upper gravel, and there is a possibility of 

 future disaster from the subjacent quicksand. 



Dr. Cressoii communicated also the following record and 

 analyses of the boring at the Continental Hotel, at the cor- 

 ner of Chestnut and Ninth streets: 



Analysis of Water from Artesian Well at Continental Hotel and 



Schuylkill River. 



Analysis made by Charles M. Cresson, M.D., 417 Walnut Street. 



Sample received March 22, 1875. 



" amount of (U. S. G. =231 Cubic Inches, =8.332698) . ...4 gallons. 

 Analysis made March 23d — April 15th. 



Condition of sample Small amount of Sediment. 



Reaction Neutral. 



Analysis No. 1442 



Sediment 



Solid matter upon evaporation to dryness 



" " " " after ignition 

 Organic !^[atte^ (Carbonic Acid, &c.), by loss on igni- 

 tion 



Silica 



Alumina 



Oxide of Iron 



Lime 



Magnesia 



Carbonic Acid 



Sulphuric acid free 



'• " in combination. 



Chlorine 

 (I 



Potash 



Soda 



Ammonia 



(SiO,).. 



(A1,0,). 



(Fe,Oj. 



(Ca"0:'). 



(MgO.) 



(CO,) . 



(SO3). . 



Artesian W.'SohuylkiilR. 



Grains in 1 

 U.S.Gallon 



13.58000 



free (CI.) 

 in combination 



free 



" albumenoid. 



Nitrogen from Nitrates and Nitrites 



Sewage 



(KO.)... 

 (NaO.), 

 (NH;,) . 



2.11800 



t 0.42800 



1.47448 



0.46908 



not det. 



none 



0.68750 



none 



0.65000 



I chiefly 



I potash. 



0.00646 



0.00442 



0.18360 



0.04420 



Grains in 1 

 U..S.Gallon 



6.99000 

 5.06000 



1.93000 



0.65000 



0.05100 



0.05900 



0.94640 



0.53280 



not det. 



none 



1.18000 



none 



0.50000 



I chiefly 



I soda. 



0.00850 



0.02142 



0.17000 



0.21420 



