[4] This great copper globe, which Picard describes as having a diameter of 4 feet 7 inches and 1 line, constructed in Augsburg under the direction of Paul Hainzel, appears to have been sent to Uranienburg about 1584. In the course of succeeding years more than one thousand stars were represented on its surface according to the observations of Tycho Brahe. In 1597 the great astronomer left Denmark to find a home in Prague, taking with him his astronomical instruments, including his celestial globe. After Brahe’s death in 1601, these instruments were purchased by Rudolph II, but on the capture of the City of Prague in 1623 by the Danish Prince Ulrich the globe with other objects of interest was taken to Copenhagen. Here it remained until 1728, when it was destroyed by fire together with the castle in which it had so long been kept. [5] John Blaeu, son of Willem, tells us that in 1591 his father was amanuensis of Tycho Brahe. See Blaeu: _Atlas Major, 1662, vol. I, p. 63_. [6] Given by Baudet, _p. 154_. [7] On the title-page of many of the books published by Blaeu, as on many of the maps which he issued, appears the expression “Sub signo solarii deaurati.” Most of the works printed by Blaeu before 1619 have as his printer’s device a balance with a terrestrial globe in the right scale and a celestial globe in the left, the latter being represented as the heavier and having the word “Praestat” printed below it. In certain later publications this mark was replaced by an armillary sphere, at the left of which is an allegorical figure representing Time and on the right a figure representing Hercules with the inscription “Indefessus agendo.” See p. 59. [8] See, for brief descriptions of Blaeu’s press, Stower, C. _Printer’s Grammar. London, 1808, pp. 303-304_; Hansard, _Typography: an historical sketch of the origin and progress of the art of printing. London, 1825, p. 550_; and especially Johnson, J., _Typographia, or the Printer’s Instructor. London, 1824, vol. II, pp. 500-551_. It is from this last named work that illustration p. 16 is taken. [9] Filips von Zesen: _Beschreibung der Stadt Amsterdam, 1664, pp. 215-216_. [10] John Blaeu’s oldest son Willem was at this time about one year old. If the statement by Zesen is correct, it perhaps points us to an interesting exhibition of parental pride. [11] See Baudet, _p. 15_. [12] See Baudet, _p. 14_. [13] The report of this survey may be found in Snellius, W. _Eratosthenes Batavus, de terrae ambitus vera quantitate, a Willebrordi Snellio suscitatus_. _Lugd. Batav., 1617._ [14] Picard, J. _Ouvrages de mathematique. A la Haye, chez P. Gosse et J. Neaulme, 1731._ [15] This letter is quoted by Baudet, _pp. 172-174_. [16] See Lelewel, J. _Geographie du Moyen Age, Bruxelles, 1852-1857, vol. II, p. 194._ [17] See De Jonge, J. K. J. _De opkomst van het Nederlandsch gezag in Oost-Indie, 1862-1909, vol. I, pp. 88-89._ [18] See Baudet, _p. 18_. [19] See Baudet, _pp. 18-19_.