After a good deal of consultation with Macmillans, who were anxious that the "English Men of Science" series should not be too extensive, I have arranged the books as follows:—

1. Roger Bacon.

2. Harvey and the Physiologists of the 17th century.

3. Robert Boyle and the Royal Society.

4. Isaac Newton.

5. Charles Darwin.

6. English Physicists, Gilbert, Young, Faraday, Joule.

7. English Chemists, Black, Priestley, Cavendish, Davy, Dalton.

8. English Physiologists and Zoologists of the 18th century, Hunter, etc.

9. English Botanists, Ray, Crew, Hales, Brown.