1) This is Henry Drummond (1851-1897), the gifted evangelist and natural science lecturer; author of "The Greatest Thing in the World", "Tropical Africa", and "The Ascent of Man".
Not to be confused with Henry Drummond "the Hun", banker, politician, MP, and founder of the Catholic Apostolic (Irvingite) Church.
2) This book was first published in 1776 and so is not the same Henry Drummond.
3) Drummond, Henry, 1786-1860. Histories of noble British families with biographical notices of the most distinguished individuals in each,
4) Henry Drummond, fl. 1903 - The Book of Joy