1-A Guide to John Locke's Essay concerning Human Understanding
Garth Kemerling
http://www.philosophypages.com/locke/g0.htm

2-Excerpts from The Life and Letters of John Locke
with extracts from his Journals and Common-place Books
Lord King

http://www.philosophypages.com/locke/k000.htm

3-ESSAYS
Michel de Montaigne
translated by Charles Cotton

http://oregonstate.edu/instruct/phl302/texts/montaigne/m-essays_contents.html

4-THE MONADOLOGY
Gottfried Wilhelm Leibniz
translated by Robert Latta

http://oregonstate.edu/instruct/phl302/texts/leibniz/monadology.html

5-EVOLUTION AND ETHICS

T. H. Huxley

http://www3.baylor.edu/BIC/WCIII/Essays/Huxley_Evolution.html