APPENDIX. 549 



to you, which must be strictly adhered to, as any deviation therefrom 

 may interfere with the track of tlie rest of the squadron, and cause a 

 waste of time. 



In making search for land, you will draw circles of your visual 

 horizon, and be particular not to omit examining the space carefully. 



You may select such an island as may seem to you most advan- 

 tageous to use the boring apparatus ; landing thereon a party under 

 a careful officer, (Lieutenant Johnson,) whom you will specially 

 instruct in its use, carefully preserving the borings for every foot in 

 depth, in boxes properly marked; the armourer and forge will of 

 necessity accompany the party. 



You will be particular in giving Lieutenant Johnson instructions 

 relative to the preservation of the health of the party, taking every 

 precaution not to come in collision with the natives, if any should 

 be on the island ; and equally cautious to guard against surprise or 

 treachery on the part of the natives. 



You will take care to furnish the party with ample supplies. 



The General Order in relation to intercourse with the natives, will 

 be observed during your cruise as heretofore. 



Tides will be carefully observed by the shore-party hourly. 



You will obtain the transverse sections of at least three of the coral 

 islands (the one on which the boring apparatus is used being one of 

 them), with the level and soundings, inside and out, on all the points 

 of the island where it is possible to obtain them, in connexion with 

 an accurate survey of the same. 



On your arrival at Matavai, you will be very particular in obtain- 

 ing sights (equal altitudes) for your chronometers, and also on all the 

 islands you may discover or survey. 



You will also try the dip and intensity, both at sea and on shore, 

 whenever practicable. 



Between thirty and forty days is deemed ample time to secure the 

 success of the boring experiment, which it is recommended should be 

 continued throughout the twenty-four hours, which may easily be 

 effected by a proper division of the force employed. 



I do not designate any particular island on which the boring expe- 

 riment is to be made : this must depend upon how you fall in with 

 the Paumotu Group. I would have you select one at as early a 

 period as possible, and after seeing the apparatus in operation, to con- 

 tinue your cruise, taking up your work in the order I have intimated 

 in the first part of these orders. 



VOL. IV. 138 



