
p. iii http://books.google.com/books?id=h7JT-QDuAHoC&pg=PR3; Lead paragraph of the Preface; Highlighted section cited in: Patricia R. Allaire and Robert E. Bradley. " Symbolical algebra as a foundation for calculus: DF Gregory's contribution http://poncelet.math.nthu.edu.tw/disk5/js/history/gregory.pdf." Historia Mathematica 29.4 (2002): p. 408
Examples of the processes of the differential and integral calculus, (1841)