Teirestrial Magnetism. 319 



branch of business which affords employment to numerous indi- 

 viduals, which has enhanced the profits of agricultural industry 

 and the value of real estate, in those parts of the country where 

 it is carried on, and contributed to reduce the cost of those pro- 

 ducts of labor, in the manufacture of which potato starch is used. 

 His mind was highly cultivated and original. He was remarkable 

 for the accuracy, variety, extent and depth of his knov\^ledge, and 

 still more so for a perspicacity of intellect, which enabled him to 

 detect error in its least suspected forms, and to perceive, with al- 

 most the quickness and certainty of intuition, truths and relations 

 which reveal themselves to most minds of even a high order, only 

 after patient and profound thought. What most distinguished 

 him, however, and peculiarly endeared him to his friends, was the 

 singular purity, elevation and benevolence of his character. It is 

 hardly exaggeration to say, that they who knew him longest and 

 best, recollect no feeling, word or act of his that was wrong. He 

 seemed to be wholly free from any desire of distinction, though 

 always active to do good, whenever and wherever he thought he 

 could be useful. Possessing a competent fortune, he made a most 

 liberal and generous use of it. In the words of one* qualified both 

 by ability and from opportunity to form a right estimate of his 

 character, "his unambitious career was bright with a daily use- 

 fulness. His life bore witness that the finest minds may find as 

 large a sphere of usefulness in the retirements of the country, as 

 among the crowd of a city. Few have been more beloved and 

 respected when living, or more widely mourned when dead." 

 He perished in a fire, January 2, 1839, in the prime of life. 



Art. VII. — On Terrestrial Magnetism; by John Locke, M. D., 

 of Cincinnati, Ohio. 



Messrs. Editors — For three or four years past, most of the 

 scientific men of our country have felt an interest in the exami- 

 nation of the elements of terrestrial magnetism on this continent. 

 The increasing attention to the subject in Europe has operated 

 sympathetically, and has excited a few of us to action. Profes- 

 sors Bache, Courtenay, Loomis, Jackson, and myself, have each 

 devoted a portion of our time to actual surveys; the results, so 



* Rev. E. Peabody, of New Bedford; Mass. 



