APPENDIX. 415 
land, islands of ice, &c, which may be observed. Astronomical 
bearings, when the weather will permit, will be preferable for this 
purpose. 
3d. You will enter also in your journal, the variation of the 
compass, morning and evening ; sketches of refraction, and minute 
observations of all phenomena that may be seen ; also, sketches of 
stratifications of ice, temperature of the water on the weather and 
lee sides of ice-islands, &c. ; the form and direction of currents, and 
the apparent formation of the ice ; also the collection and preservation 
of any specimens of earth or stones that may be discovered on the 
ice, and the appearance of any halos, auroras australis, &c. 
4th. In the event of parting company, you will rendezvous, first, 
for the Porpoise, off Cape Melville, George's Island, in latitude 
61° 55' S., longitude 58° W., to remain two days ; and, secondly, at 
and near the coast of the east side of Palmer's Land. You will, in 
such a case of separation, avoid by all possible means being shut up 
in the ice, and will, on the probability of such an event, proceed at 
once to Deception Island, which harbour you will if possible enter, 
and deposit in a grave formed of stones, on the north side of the 
entrance of the harbour, information relative to your parting com- 
pany, &c. ; and you will remain there for orders as long as your 
safety will allow, and while there you will hunt for and examine a 
self-registering thermometer, left there some time since on the point 
forming the cove. 
5th. You will give particular attention to the health and comfort of 
all on board, and you have an ample supply of provisions, clothing, 
preserved meats, antiscorbutics, &c. 
Wishing you a safe and successful cruise, 
I am, &c, 
Charles Wilkes, 
Commanding Exploring Expedition. 
Lieutenant R. E. Johnson, 
In charge of Tender Sea-Gidl. 
