Chapter 3: The date of the day the doctor killed the seal is stated as

the 18th and should be the 15th. The date mentioned two paragraphs previously was the 14th, and the date mentioned as the next day in the next paragraph is the 16th.

Chapter 5: "Hatteras loaded the gun with the last charge of powder" should be "the doctor loaded the gun with the last charge of powder" to agree with the French and the sense of the paragraph.