Source: https://books.google.com/books?id=0tcMAAAAIAAJ OCRed text: https://books.google.com/books?id=0tcMAAAAIAAJ&pg=PP7&focus=viewport&output=text Alternative digitisations: https://archive.org/details/astatisticalacc01unkngoog http://stabikat.de/DB=1/XMLPRS=N/PPN?PPN=666175276