APPENDIX. 559 



of Hood's Canal, which you will proceed to survey, and endeavour to 

 find a passage through the head of it, into Puget Sound, by some 

 outlet or channel that may possibly exist : if one should be found, 

 you will continue your survey through it, and into the waters of 

 Puget Sound; if not, after completing the survey of Hood's Canal, 

 you will return by its entrance to Admiralty Inlet, and thence toward 

 the ship. 



On your arrival at the Narrows, you will again take up the survey, 

 connecting it with Mr. Totten's No. 1, and Mr. Eld's No. 8, and 

 from thence into Puget Sound, taking its northern side, and islands 

 near it in your progress to the southward and westward. From this 

 point you will despatch one of your boats to me, with information of 

 your progress. 



The signals you put upon these islands must be well marked, so as 

 to be distinctly seen and recognised. 



You will continue up the arms and inlets, until you reach the head 

 of the sound, and all its branches, after which you will continue the 

 survey toward the ship at Nisqually. 



In case of your falling in with the Porpoise, Lieutenant-Com- 

 mandant Ringgold has orders to retain you in company until he 

 reaches the mouth of Hood's Canal, when yoa will separate from him. 



The following instructions will guide you in your surveys. 



Whenever practicable, your bases will be measured by chain, and 

 the true direction of the line found. 



Astronomical observations will be particularly attended to, for lati- 

 tude and longitude, by circummeridian and equal altitudes, daily if 

 possible, and from those points, or the hills or bluffs near by, observa- 

 tions will be made with the theodolite, on all distant points or mountain 

 ranges, witli a view to ascertain the actual position of peaks, their 

 extent and height, and to form a connexion with your work. 



For this purpose, I recommend large trees to be barked or white- 

 washed, which will be found the most convenient signal, and easily 

 distinguished on each side of the straits. An old piece of canvass 

 whitewashed and placed against a dark ground, or cut into a trian- 

 gular form, and tied between branches of trees, forms a mark easily 

 distinguished, and may be left standing. 



It is extremely desirable that the points astronomically ascertained 

 should be brought directly into connexion with each other by trian- 

 gulation, and no opportunity of getting the bearing of points in 

 transit should be neglected. 



