Human physiology
Free to read here, from Project Gutenberg.
A Practical Physiology: A Text-Book for Higher Schools
General Anatomy, Applied to Physiology and Medicine, Vol. 1 (of 3)
First Book in Physiology and Hygiene
General Anatomy, Applied to Physiology and Medicine, Vol. 3 (of 3)
General Anatomy, Applied to Physiology and Medicine, Vol. 2 (of 3)