He mentions his years of work on his theory, and the arrival of Wallace at the same conclusion, which led him to "publish this Abstract" of his incomplete work.
Zmienil sa o rokoch práce na svojej teórii a o Wallaceovej zásielke s rovnakým záverom, a o tom, že to je príčina "publikovania tohto súhrnu" jeho neúplnej práce.