The special focus of this volume is classification of primates, including studies on evolution and early life, and the characteristics of mammals. The Harmsworth Natural History series was authored by prominent experts in natural history in the early 20th century. It surveys the living creatures of the world, at that time, and was the most comprehensive set of studies of its kind made available to the public. Richard Lydekker (1849 - 1915) was an award-winning naturalist, author and geologist; Sir Henry "Harry" Hamilton Johnston, (1858 - 1927), was an explorer, botanist, linguist and colonial administrator, travelling extensively in Africa; and Professor Ainsworth-Davis (1861-1934) specialised in zoology, geology and biology. We are republishing this vintage work in a new modern edition, complete with reproductions of the detailed plates featured in the original version.