The ninth chapter of the thatched cottage mainly described the following contents: The father of the protagonist, Chen Huanzhang, was a doctor. He often worked in the hospital and also ran a pharmacy. In Chapter 9,"Medicine House", some stories of the medicine shop were described, including: 1. The rise and fall of the pharmacy: The pharmacy used to be a very large pharmacy, but as time passed, business gradually declined and eventually became depressed. 2. The secret recipe of the pharmacy: Chen Huanzhang's father had kept some secret recipes and herbs when he was running the pharmacy. These secret recipes and herbs played an important role in treating diseases. Allergy to drugs: Some drugs sold in the pharmacy may cause allergic reactions, so doctors need to closely observe the patient's reaction and take appropriate measures. 4. Folk herbal therapy: In addition to selling traditional herbs, the pharmacy also provides some folk herbal therapy, including massage, acupuncture, etc. These treatments have a certain effect on the treatment of diseases. Through these contents, we can understand that Chen Huanzhang's father is an experienced and responsible doctor. He also runs a pharmacy and provides important help to people in treating diseases.