xviii INTRODUCTION. 
and the details in the Narrative of the duties which have been per- 
formed. 
In the observatory duties and pendulum observations, I was princi- 
pally assisted by Lieutenant Carr, Passed Midshipmen Eld and Blunt, 
and Mr. Howison. I deem it my duty to speak of the devotedness of 
Assistant-Surgeons Fox and Holmes, who, besides attending to their 
engrossing medical duties and meteorological observations, manifested 
the utmost zeal in collecting and making researches in the various 
departments of natural history. They also frequently assisted in the 
surveys, and I found them ever ready to engage in any thing that 
could promote the success of the Expedition. 
It gives me great pleasure to acknowledge the credit that is due, 
and the obligations I feel under to Mr. R. R. Waldron and Mr. Wil- 
liam Spieden, Pursers attached to the Expedition, for their promptness 
in procuring the supplies, and at all times forwarding the business of 
the Expedition; none of the departments of the service were more 
efficient than that over which they had control. 
Since our return, Lieutenants Carr, Budd, Totten, and Eld, with 
Mr. F. D. Stuart, who were attached to the Expedition, have been 
engaged under my direction in recalculating and revising our nume- 
rous surveys, previous to their being engraved. 
To Messrs. Drayton and Agate, the artists of the Expedition, I feel 
it due to make known how constantly and faithfully they have per- 
formed their duties. The illustrations of these volumes will bear 
ample testimony to the amount of their labours, and the accuracy 
with which they have been executed. 
Mr. Drayton has had the management of the whole engraving 
department assigned him by the Committee of the Library, and has 
accomplished what very few believed could be done in this country. 
The distribution of the work among the engravers has given general 
satisfaction, not only to the Committee, but to the artists themselves, 
and has afforded a national encouragement to this description of art, 
the benefit of which it will long continue to feel. 
To Mr. Drayton I owe many acknowledgments for his constant and 
untiring zeal in all the departments of the Expedition, not only during 
