What is the author's tone in The Mismeasure of Man by Stephen Jay Gould?

The book is written in the third person in an objective academic manner. The author is an academic researcher and this comes across in the tone of the book. His arguments are not base on emotion, but on fact as he points out how racial prejudice clouded the early results in the field of intelligence measurement. Researchers may have biased samples and methodologies that lead to biased results without consciously intending it to be this way. This is what Gould points out throughout the book.