KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 57. N:0 4. 



193 



done by systematic investigation. If therefore a new island was added on insufficient 

 grounds, or if an old dubious one was allowed to remain, they did not tliink that they did 

 any harm by that: it was only a warning to the sailor to beware of possible dangers. Even 

 in our own days the väst spaces of the Pacific are not completely explored; and even the 

 most modern charts show a number of rocks or shoals whose existence or position is 

 imcertain. The United States Hydrographic Office has laid it down as a rule "to retain 

 them until af t er at least two thorough searches by vessels adapted to the purpose". 1 



If we set out, in the same way as above, the islands that lie in the latitude of the 

 Northern Mariannes, we get the following arrangement: — 



Islands in 19°- 22° N. lat. 



Sanches 



Hora 



Grega 



Guagua 



S. jeronimo 

 S. bernardo 

 los martires 





los frailes 



dos companeras 



Monges 

 la vezina 

 Desgrasiada 



Delisle 



An island 

 Farelhon 

 Urac Isle Dé- 



serte 

 Tinias ou Maug 



3 islands 



2 islands 

 La Mira 



La Mira 

 Deserta 



los Monges 

 la Vagina 

 Guatiada 



Cabrera Bueno 



Farellon de 

 Paxaros 

 Isletas 



Bolcan Grande 

 Grigan 



Los Jardines 







Los Monges 



La Mira 



La Desgraciada 



Anson 



Farollon 



Urac 



Vulcano grande 



Guigan 



Los Jardines 



(3) 



Dicierta 

 Vulcano 

 Camira 



Lamira 

 Dicierta 



Los Mojas 



La Mesa 



La Disgraciada 



Seville chart 



Farallon de 

 Paxaros 

 Urac 



Bolcan grande 

 Grigan 



Los Jardines 



(2) 



3 islands 



2 islands 



Los Monges 

 La Desgraciada 



La Pérouse 



Farallon de 

 Paxaros 

 las Urracas 

 Agrigan 



Los Jardines 



(2) 



Desierta 

 Volcan 

 la Mira 



la Mira 

 Desierta 



los Monges 



la Mesa 



la Desgraciada 



Stockholm chart 



Farillon 



Vrac 



bolcan grande 



grigan o Purigan 



) first Edition of 

 1880; Introductio 



Los Jardines 



(3) 



deserta 

 Bolcan 

 La Mira 



Mira 



La desierta 



avigation in the Noi 



Los Monjos 



Mira 



La Desgraziada 



1 Supplement te 

 William Gibson. Wash 



Eeported Dangers to N 

 i. 



ih Pacific Ocean, 



K Sv. Vet. Akad. I 



landl. Band 57. N:o 



4. 







25 



