Source: https://books.google.com/books?id=Ew4uAQAAIAAJ OCRed text: https://books.google.com/books?id=Ew4uAQAAIAAJ&pg=PP2&focus=viewport&output=text Alternative digitisations: https://archive.org/details/astatisticalacc23huntgoog https://books.google.com/books?id=CstCAAAAYAAJ https://books.google.com/books?id=ktcMAAAAIAAJ http://stabikat.de/DB=1/XMLPRS=N/PPN?PPN=666166218