from other experienced navigators and pilots, who have sailed through the Strait of Gibraltar to Italy and the surrounding countries. And this I have carefully arranged, showing all harbors, roads, bays, courses and directions; giving myself a great deal of trouble, and incurring a great deal of expense. Since I did not like to rely alone upon myself, I invited to my home several seamen and pilots, who sailed the Mediterranean Seas, with whom I have communicated about my work. I made corrections whenever I found that their observations had been more exact than my own, that it might not seem as if I, being proud, intended to make a name for myself, and as if I had done this work carelessly, but that it should be clear I had gone to much trouble.” A resolution of the States General, dated March 9, 1623, granted to Willem Jansz. Blaeu, for a period of ten years, the exclusive right to print and publish a work referred to in the resolution as “een compendium van den Zeespiegel.” It appears, however, that this was not issued until 1625, and under the title “Tafelen van de declinatie der Sonne, ende der voornaemste vaste sterren, Mitsgaders van ’t verscheyden gebruyck der Noordsterre Nieulycx, allen Zeevaerenden ten dienst, ghecalculeert door Willem Jansz. Blauw,” or “Tables of the declination of the sun and of the most important planets with the different uses of the North Star calculated anew for the use of all navigators by Willem Jansz. Blauw.” On the title-page appears a representation of the cross-staff and the astrolabe, with the imprint “t’ Amsterdam By Willem Jansz. Blauw in de guide Sonnewyser, Met privilegie, Anno 1625.” The statement is made in the preface that “from the exact observations of Tycho Brahe, we have calculated new tables of the declination of the sun.” These same tables are to be found in the Zeespiegel of 1627, and were intended to replace the old tables of the “Nieuw Graetbouck” of the year 1605.