330 Z. Hatch — Marine Terraces in S.E. Connecticut. 



preserved here than at any place to the southwest seems to be 

 due to the absence of the coastal plain and to the hardness of 

 the rocks. Farther west in Connecticut, the coastal plain in 

 Long Island probably caused the waves to spend their force 

 before they could produce much effect on the crystalline rocks, 

 while any effect on the coastal plain has since iDeen destroyed 

 by glaciation. 



The rocks in the Stonington region, on the other hand, bore 

 the brunt of the heavy waves rolling in from the southeast. 

 Thus the terrace carving here was perhaps more perfectly done 

 than elsewhere, because of the exposure and relief of the 

 region, and better preserved because of the hardness of the 

 rocks. The working out of the geology over two-thirds of 

 the quadrangle makes it possible to say that in this small 

 region, at least, the terraces are independent of rock structure. 



SCIENTIFIC INTELLIGENCE. 



I. Chemistry and Physics. 



1. The Recovery of Sulphur from the Sulphur Dioxide of 

 Smelter Gases.— A. E. Wells has described an investigation 

 upon what is called the " Wet Thiogen Process " which is 

 designed for the purpose of disposing of the objectionable, waste 

 sulphur dioxide from smelting operations, and at the same time 

 recovering the sulphur as such. The process is based upon the 

 fact that when barium sulphide, either in finely divided water 

 suspension or in solution, is added to a solution of sulphur dioxide 

 the following reaction takes place : 



2BaS + 3S0, = 2BaS03 + 3S 

 2BaS + 3S0, = 2BaS,03+ ^ 



or, 



In carrying out the process the gases after being cooled and freed 

 from dust are passed through a tower in which the sulphur 

 dioxide is absorbed by water or mother liquor. To the solution 

 powdered barium sulphide is added to produce the reactions that 

 have been mentioned. The precipitate is settled, filtered, dried, 

 and distilled in order to obtain the free sulphur and one-half of 

 the sulphur of the barium thiosulphate. The liquid is returned 

 to the absorption tower while the residue, consisting of barium 

 sulphite and sulphate, is reduced to sulphide by heating with car- 

 bon, and is used again in the process. The operation has been 

 studied both on a laboratory scale and on a scale that may be con- 

 sidered semi-commercial, and the results indicate that it can be 



