SCIENCE. 



67 



Constituents. 



Total solid constituents 



After incineration 



Lime(CaO) 



Sulphate of lime (Cao, S0 3 . 2 HO) 



Carbonate of lime (CaO, C0 2 ) 



Bicarbonate of lime (CaO, 2 Co 2 ) 



Magnesia, (MgO) 



Chloride of Magnesium (Mg Cl 2 ) 



Carbonate of Magnesia 



(5 MgO, 4 Co,, 6HO).. 



Chlorim (CI.) 



Chloride of Sodium (Na CI) 



Soda(Na 2 OJ 



Sulphuric Acid (S0 3 ) 



Sulphate of Sodium (Na 2 0, SO.,) 



Iron (Fe O) 



Silica (Si 2 ) 



Carbonic Acid (Co 2 ) 



Organic and Volatile matter 



Grains in an Imp. Gal. 



Newark City Aqueduct. 



March. 



3-147 

 2-377 

 1-357 

 None. 

 2.220 



Trace. 



0.211 

 0-379 



None. 



Trace. 

 Not estimated 



0.378 



June. 



6.688 

 1.225 



'M52 



636 



0.318 



1 245 



1.293 

 0.705 

 o-957 



Public Well, 



cor. Orange and 



Broad Streets, 



Newark. 



March. 



22.277 

 17.673 

 7-15° 

 6.016 

 9.270 



Trace. 



3-392 

 5596 



2.798 



Tiace. 

 Not estimated. 



1-395 



Public Well, cor. 

 Ferry and Con- 

 gress Streets, 

 Newark. 

 March. 



36.929 



21.312 



6.842 



6.016 



8.717 



Trace. 



5-939 

 9 794 



2.798 



Trace. 

 Not estimated. 



12.408 



Balbach's Arte- 

 sian Well, 

 Newark. 

 March. 



125 833 

 92.849 



4°-953 

 120.346 



3-155 



Trace. 



0845 

 1398 



55-974 



Trace. 

 Not estimated, 



None. 



Newark 

 Driven 

 Well. 

 June. 



49.782 



6.940 

 6.052 

 7.940 



2.468 



5.981 

 8.486 

 13.901 

 12.187 

 9.865 

 11.188 



4.701 

 7.199 

 7 374 



New York 

 Driven 

 Well. 

 June. 



31-434 



4-396 

 8.665 



3-3°4 

 3.162 

 1-815 

 5.824 



6 -374 

 8215 



4-3I5 

 5.096 



1.736 

 4-396 

 6.446 



Constituents. 



Total solid constituents 



After incineration 



Lime (CaO) 



Sulphate of lime (CaO, So.,, 2HO) 



Carbonate of lime (CaO, C0 2 ) 



Bicarbonate of lime (CaO, 2C0 2 ) 



Magnesia (MgO) 



Chloride of Magnesium (MgC! 2 ) 



Carbonate of Magnesia 



5 MgO, 4CO>, 6 HO). 



Chlorine (CI ) 



Chloride of Sodium (NaCl) 



Soda (Na 2 0) 



Sulphuric Acid (S0 3 ) 



Sulphate of Sodium (Na 2 0, SO,) 



Iron (FeO) 



Silica (Si0 2 ) 



Carbonic Acid (C0 2 ) 



Organic and Volatile matter 



Grammes in a Litre. 



Newark City Aqueduct. 



March. 



0.0450 

 0.0340 

 0.0194 

 None. 

 0.0346 



Trace. 



0.0030 

 o 0050 



None. 



Trace. 

 Not estimated 



0.0054 



June. 



0.0956 



0.0176 

 0.0298 

 0.0096 



O.0064 

 0.0050 

 O.0105 



0.0090 

 0.0086 

 0.0035 

 0.0175 



0.0185 



O.OIOI 



0.0136 



Public Well 



cor. Orange and 



Broad sts., 



Newark. 



March. 



0.3184 

 0.2526 

 0.1022 

 0.0860 

 0.1325 



Tiace. 



0.0485 

 0.0800 



0.0400 



Trace. 

 Not estimated 



0.0104 



Public Well 



cor. Ferry and 



Congress sts., 



Newark. 



March. 



0.5278 

 0.3046 

 0.9780 

 0.0860 

 o 1246 



Trace. 



0.0849 

 0.1400 



0.0400 



Trace. 

 Not estimated. 



o. 1778 



Balbach's Arte- 





sian Well, 





Newark. 



Well. 



March. 



June. 





1.7884 



0.7115 



1.3270 





0.5853 



0992 



I.7200 



0.0865 



0.0451 



O.H35 



Trace. 



0-0353 





0.0855 



0.0121 



0.1213 



0.0200 



0.1987 





0.1742 



0.8000 



0.1410 





01599 



Trace. 





Not estimated. 



0.0672 





0.1029 



None. 



0.1054 



New York 



Driven 



Well. 



June. 



0.4485 



0.0692 

 0.1236 



0.0471 

 0.0451 

 0.0259 

 0.0830 



0.09C9 

 0.1172 

 0.0616 

 O.0727 



0.0248 

 0.0627 

 0.0920 



We have been shown a number of photographs copy- 

 righted by Mr. Geo. Cumming, of this city, entitled, 

 ' Studies of the Color Glow, or Rectilinear Spectrum." 

 The original colored line drawings which were exhibited 

 in 1879, at the Academy of Design and American Insti- 

 tute, consist of geometrical forms drawn in straight 

 lines, in many hues of color, forming central globes with 

 bright scintillating effects. While the photographs give 

 but the form on a much reduced scale without, of course, 

 the chief beauty — the blended color-lines— they are curious 

 as illustrating the depth of tone obtained by the camera 

 from any given shade or tint — light green for instance 

 coming out deep black and violet being almost lost in 

 the process. The originator has more of an artistic than 

 a practical feeling in their conception, and calls his vari- 



ous designs spring, sunset, autumn, sunrise, etc ; his 

 idea being to embody a theory of color with pleasing 

 effect, rather than to stamp himself as either an artist or 

 designer. 



We desire to direct special attention to the meeting of 

 the American Society of Microscopists at Detroit, on 

 the 17th of this month, presided over by Professor H. L. 

 Smith, of Hobart College, Geneva, N. Y. 



The conception of such a national meeting of micro- 

 scopists is most excellent, and under such able leadership 

 the results of the meeting cannot fail to promote the 

 extension of microscopical research, and its elevation to 

 the high position it should occupy, as one of the greatest ' 

 aids to our possession ot scientific knowledge, the com- 

 prehension of the workings of Nature and " of things 

 around us." 



