[6] 



WATER SUPPLY AT WOOD S HOLL. 



21D 



to 3,000 gallons per hour, tlie supply was undiminished in quantity, the 

 water clear and potable, excepting- the flat taste already noted. Tlie 

 quantity of chlorine rose, however, from 13.3 to 24 grains per gallon, 

 corresponding to an increase from 21.0 to 39. G grains of salt, or nearly 100 

 per cent. After thirty hours' pum])ing-, at an average rate of 1,300 gal- 

 lons per hour, the amount of chlorine had increased further to 2.").S gniins, 

 corresponding to 42.C grains of salt per gallon, the <iuantity oC water 

 being still unchanged. Several specimens had been sent to Washing- 

 ton, to the laboratory of the Geological Survey, for analysis, in the 

 mean time, and, as the reports of these analyses, while disagreeing some- 

 what among themselves, showed no unwholesome or injurious ingre- 

 dient, the sup])ly was accepted, and mains were led from the wells to a 

 water-tower near the main buildings, there to be filtered from sand and 

 gravel in a large " sand-chamber," and pumped up into tanks for dis- 

 tribution to the several parts of the station. 



Meanwhile the necessary a])paratus and su])])lies had been got to- 

 gether for a more complete examination of the watei" on the spot, which 

 was concluded on the 11th September, with the following result: 



" Se])tend)er 11, 1884. Four liters of water wi^re draw^n from the main 

 as it entered the tank. Puminng has been continuous, day and night, 

 for thirty days, at an average rate of 1,000 gallons })er hour, or 820,000 

 gallons in ad<lition to the quantity drawn previously. There has been 

 no diminution in the supply, and the water continues to be clear, with- 

 out sedinuMit, odorless, but characterized l)y a distinct, rather disagree- 

 able, flat taste, thought by some observers to be 'brackish.' Reaction 

 to litmus neutral (or perhaps very feebly alkaline). 



Total solids, dried at 100° C.. 



Total solids, dried at 150°-200o O 

 Total solids, heated to I'eduess . . 



Grains to 

 the im- 

 perial gal- 

 lon. 



Grains to 

 the liter. 



1.214 

 1.014 

 0.900 



"A portion of the residue was fused, but did not blacken, at a red 

 heat. The loss on ignition was accom]>anied by decrepitation, and ap- 

 pears not to be due to organic matter, 



"Then: 



