428 APPENDIX. 



be taken, when possible, with the artificial horizon, and your courses 

 and distances carefully ascertained with azimuth bearings on all 

 points, both before you reach them and after you have passed 

 them. 



Each boat will keep a careful and particular log of her proceed- 

 ings, which will be transmitted to me, together with your report and 

 the chart made during your passage. You will make no unnecessary 

 delay on your route, and care must be taken that your men be not 

 suffered to remain in wet clothes at night. 



Comparisons will be made with your chronometers daily, carefully 

 noting them in your log-book. 



You will always keep your boats in signal distance, separating 

 them only in cases of necessity, for a short time. 



When practicable, Mr. Dyes will be employed in collecting 

 shells, &c. 



You will communicate these instructions to Mr. Blunt. 



I am, &c, 



Charles Wilkes, 



Commanding Exploring Expedition. 



Lieut. Geo. F. Emmons, 



U. S. Ship Peacock. 



IV. 



U. S. Ship Vincennes, 



Ovolau, May 13th, 1840. 



Sir, 



You will proceed with the Flying-Fish to survey the following 

 islands of the Feejee Group. For this purpose Lieutenant Under- 

 wood is ordered to accompany you, with a boat and crew, and Tom 

 the pilot. 



1 . Ambatiki, and its distance from Ovolau by patent log, examining 

 its reefs on both sides. 



2. Nairai, with its reefs to the south. 



3. Angau. 



4. Matuku, Moalo, and Totoia. 



5. Reef called Tova. 



6. Vanua-vatu. 



