The most common presenting complaint of DID is depression, with headaches being a common neurological symptom. Co-morbid disorders can include substance abuse, eating disorders, and anxiety. Things like posttraumatic stress disorder (PTSD) and personality disorders are introjected behaviors only.
Fourteen of them were the notebooks Darwin used on his shore excursions during the voyage of the Beagle (1831-1836). This is the first complete edition of these important notebooks, thirty years in the making. The notebooks were also published in 2009 as a book: Gordon Chancellor and John van Wyhe eds.
Darwin was 22 years old at the time, and Fitzroy was only 4 years older. The Beagle was a compact 90 foot long ship with a crew of 74. There was little space, even for the captain. Darwin shared a cramped 10 X 11 foot cabin with two other men, a cabin boy, and their belongings.