Röntgen’s second communication to the Physikalisch­ medizinischen Gesellschaft was on March 9th 1896 and was a continuation of the first with additional numbered paragraphs 18-21. His third and final communication on the subject of X-rays, entitled 'Further observations on the properties of X-rays’ was submitted to the Royal Prussian Academy of Science, Berlin on March 10th 1897 and published in the Annalen der Physik und Chemie. An English translation appeared in the Archives of the Roentgen Ray in February 1899.