Examination of Sand from an Artesian Well. 329 

 b, secondary. (3.) 



/ii 3 c» c x" H,cy 



V H f L ) \ H,C c H 



H. H 3 C y C a II, i" u ±l 



H H 



C 



(H,C)"] 

 H3C.H3C 



II 



0. 



Secondary dicarbol of the first order. Secondary dicarbol of the second order. 



III. Tricarbolic radicals. 



(H S C.C)'" 



H 3 

 H. 



K 



(IIC)'" 

 H,.ILC 



-j£».a 



H, 



IY. Tetracarbolic radical. 

 H s J 



XXVI. — Results of a Microscopical Examination of Specimens 

 of Sand obtained from an Artesian Well. 



By Arthur Mead Edwards. 



Read January 10th, 1870. 



The specimens, five in number, were brought up from an 

 artesian well or boring made at New Orleans, La., in the month 

 of February, of 1868. The opening was not a true boring, as 

 no boring instrument had been made use of, but was effected 

 by means of driving down a sharp-pointed iron tube, for the pur- 

 pose, if possible, of obtaining water; but, at the depth of thirty- 

 two feet, gas of an inflammable character had been struck, which 

 escaped in large quantities, so much so that it was for some time 

 used for the purposes of illumination in a building near by. 



Each specimen, as labelled, and the results of the examination, 

 are as follows : — 



APRIL, 1870. 22 Am.. Lyc. Nat. Hist., Vol. LX. 



