47^ Mr. Hellins on the Rectification , See. 
hyperbola, when the abscissa is taken on the asymptote. This 
I thought it might be proper to remark, that the less experienced 
readers of this Paper might not be misled by so great an autho- 
rity as that of Dr. W 7 aring. Whether or not he ever corrected 
these oversights in any of his subsequent publications, I cannot 
ascertain, for want of books. 
