What book did Ivan Pavlov publish about the digestive glands in 1897?

In 1897, the Russian physiologist Ivan Pavlov published his influential book titled Lectures on the Work of the Digestive Glands. This work summarized his extensive research into the secretory activity of digestion, which he conducted using innovative surgical procedures to study gastrointestinal functions in animals. His pioneering contributions to the understanding of digestive secretions eventually earned him the Nobel Prize for Physiology or Medicine in 1904.12