But when he gets back from the voyage, his interests start to expand even further: psychology, botany; for the rest of his life, he's moving backwards and forwards between these different fields.
Tapi saat ia kembali dari perjalanan, minatnya berkembang lebih jauh: psikologi, botani; selama masa hidupnya, ia bergerak maju-mundur di antara bidang-bidang berbeda ini.