Sassonia emphasized the importance of the pulse in diagnosis, and provided the first recorded description of heart block. Pages 57-61 contain graphic representations of the pulse using dashes of unequal length. Digital facsimile of the 1603 edition from Google Books at this link.

An earlier version was published in an unauthorized collection of the author's writings: Tractatus triplex: De fefrium [sic] putridarum signis et symptomatibus: De pulsibus: et de urinis ... e dictantis ejus ore exceptus, in certa quaedam capita redactus praeloque commissus a Petro Uffenbachio: accessit ejusdem doctrina ... de lue venerea seu morbo Gallico (1600). Digital facsimile of the 1600 edition from Google Books at this link.