2 
the 
232 Gould's Report on Trans-Atlantic Longitude. 
tion of the problem in hand, required the determination of three 
separate longitudes: 1, between Greenwich and Valencia; 2, 
between Valencia and Heart’s Content, and 8, between Heart's 
Content and Calais, the easternmost station of the series con- 
nected by the telegraphic determinations of the Coast Survey. 
he first was accomplished by the ready co-operation of the 
Astronomer Royal. The second and third involved the princi- 
pal labor, and presented the chief difficulties. 
And these difficulties were by no means trifling. Wretched 
climate, defective land lines, unprecedented distance, with other 
untoward conditions, all conspired to render success by no 
Tt was not until the 14th that any instrumental adjustments 
were furnished for those stations by Mr. Davidson. But. even 
with these provided, and with the most laborious precautions 
taken in other respects, all efforts at direct communication 
ibe unavailing, day after day, and week after week. 
Davidson's health becoming impaired, his place at Calais was 
taken by Mr. Boutelle, one of the most experienced officers of 
survey. Singularly enough, it was only a couple of hours 
re his arrival, on the 11th December, ‘that, suddenly, the 
ed communication was found to be established. “A 
mmunication 
