882 TRANSACTIONS OF THE AMERICAN INSTITUTE. 



Columhus, was about $170,000,000. A century later it had 

 increased to $690,000,000. At the commencement of the present 

 centur3^ it was calcuhxted to be $6500,000,000. 



The Professor conchided by expressing the opinion that in this 

 country, at least, there will be gold enough for the next thousand 

 years. 



Dr. L. Feuchtwanger read the following paper on 



Natrona Chemicals. 



Natrona is a new and extensive manufacturing place. Its 

 monthly chemical products are as follows: 



40,000 pounds of concentrated lye. 



250,000 pounds of oil vitriol. 



15,000 pounds of aqua fortis. 



15,000 pounds hydrocloric acid. 



1,200 barrels salt. 



100,000 pounds copperas. 



4,000 barrels of coal oil are refined there. 



100,000 bushels of coal are dug out, besides a large quantity of 

 allum, pure allum cake or sulphate of aluminum, sal soda, bicar- 

 bonate of soda, &c. 



There are also decomposed 400,000 pounds of cryolite, which 

 require 200,000 pounds of lime per month, for the production of 

 caustics, sal soda, &c. 



This place commenced about twenty-five years ago, on account 

 of its saline springs. It is situated on the Alleghany river, twenty- 

 three miles from Pittsburg. The Western or Pittsburg railway 

 passes through the place, and the Alleghany Valley E. E. passes 

 on the other side of the river, and there are employed 1,200 hands 

 for the production of the above named chemicals. Some enter- 

 prising Philadelphians em1)arked in the manufacture of salt, and 

 purchased a few hundred acres where a large deposit of coal is 

 contiguous to the saline spring, which is now about 450 feet iu 

 depth. The bittern, or what is called the remaining liquid after 

 the salt has been crystalized out of it, has been treated for bro- 

 mine, and some years ago I purchased myself 100 lbs. of the latter, 

 while at present there are l)ut 10 lbs, raanufiictured per day. 



The low price of the salt, and the desire of the company to 

 make the alkalies in the same prolific and profitable manner as the 

 English manufacturers produce them from the salt, incited them 

 to erect large works for that purpose. One of the most important 

 constructions is the oil of vitriol chambers and its concentrating 



