OTHER PROPERTIES OF CAST IRON. 273 
affect the commerce of one iron more than 
another. The object I had in view was entirely 
different: it was of a scientific nature, unac- 
companied with any other consideration than 
that of giving, by direct experiment, a correct 
epitome of the chief properties of each iron, in 
order to determine its relative value in reference 
to enlarged and useful application. This has 
been done to the best of my ability, and, I trust, 
the classification thus attempted, will fully 
demonstrate the strength and other properties 
of this invaluable material. I entertain hopes 
that what has already been done will stimulate 
others to further and more successful efforts. 
There yet remains a wide field for experimental 
enquiry, and whoever enters upon it with an ar- 
dent mind and a strong desire for truth, with a 
determination to be at the necessary expence and 
trouble, having first made himself well acquainted 
with what has been done by others, will reap a 
rich and abundant harvest. 
