274 Address of Sir William Thompson. 
afforded to them for codperating in their work on this subject 
Lloyd, Phillips, Fox, Ross, and abine made magnetic observa 
tions all over Great Britain ; and their results, collected by Sa 
ine, gave for the first time an accurate and complete survey 
of terrestrial magnetism over the area of this island. [am u 
formed, by Prof. Phillips, that, in the beginning of the Assoc 
ation, Herschel, though a “sincere well-wisher,” felt doubt 
to the general utility and probable success of the plan and pur 
ose proposed; but his zeal for terrestrial magnetism brought 
im from being merely a sincere well-wisher to join actively 
and cordially in the work of the Association. ‘In 1838 he 
gan to give effectual aid in the great question of magnetical 
tables of the values of the magnetic elements deduced from 
observation are Ps a at once to make use of them,” and 
that he intends to take into account terms of at least one order 
ban fe vig included by Gauss. The form in which ot! Te. 
- quisite data are to be presented to him is a magnetic ¢ ni 
the whole surface of the globe. Materials deigaiciat © trav- 
