More to southward we find in the chart of 1627 I. d'Edels landt, made in July 1619 by the ships Dordrecht and Amsterdam, commanded by Frederik De Houtman and Jacob Dedel [*]. To the north of Dedelsland the coast is rendered difficult of access by reefs, the so-called (Frederik De) Houtmans-Abrolhos (now known as the Houtman Rocks), also discovered on this occasion [**]. To the south, in about 32° S. Lat. [***] Dedelsland is bounded by the Landt van de Leeuwin, surveyed in 1622 [****]. Looking at the coast more closely still, we find in about 29° 30, S. Lat. the name Tortelduyff (Turtle Dove Island), to the south of Houtmans Abrolhos, an addition to the chart dating from about 1624 [*****]. [* See the documents sub No. XI (pp. 14 ff.). If NORDENSKI÷LD had known these documents, he would have withheld the second alinea on p. 199 of his interesting _Periplus_.--The doubts, also, concerning Frederik De Houtman's share in the discoveries on the west-coast of Australia, expressed by COLLINGRIDGE (_Discovery_ p. 304), CALVERT (_Discovery_, p. 25), and others, are now likely to be set at rest.] [** They were then held to lie in 28° 46'. On this point see also the documents of PELSAERT'S shipwreck (No. XXIII, pp. 55 ff).] [*** About this latitude, between 32° and 33° S. Lat., also De Houtman and Dedel estimated themselves to be, when they first came upon land. They afterwards ran on on a northerly course.] [**** See the documents sub No. XII (p. 17).] [***** See No. XVI (p. 50) below, and the highly curious charts Nos. Nos. 16 and 17.] So much for the highly interesting chart of Hessel Gerritsz of the year 1627. If we compare with it the revised edition of the 1618 chart, we are struck by the increase of our forefathers' knowledge of the south-west coast. This revised edition gives the entire coast-line down to the islands of St. François and St. Pieter (133° 30' E. Long. Greenwich), still figuring in the maps of our day: the Land of Pieter Nuyts, discovered by the ship het Gulden Zeepaard in 1627 [*]. [* See No. XVIII (p. 51) below.] North of Willemsrivier, this so-called 1618 chart has still another addition, _viz_. G. F. De Witsland, discovered in 1628 by the ship Vianen commanded by G. F. De Witt [*]. In this case, too, it is difficult to determine exactly the longitudes between which the coast-line thus designated is situated. [**] But with great distinctness the chart exhibits the chain of islands of which the Monte Bello and tha Barrow islands are the principal, and besides, certain islands of the Dampier Archipelago, afterwards so called after the celebrated English navigator. I would have these observations looked upon as hints towards the more accurate determination of the site of this De Wit's land, and they may be of the more value since the small scale of the chart renders an exact determination of it exceedingly difficult. [* See No. XXI (p. 54) below.] [** See, however, No. XXI., C. _infra_.]