Sketch of Dr. John Locke. — Winchell. 349 
seems to refer in his own report as "another service to the 
country.'* His synoptical report for 1847, dated October 'I'), 
and printed in the Senate documents (II) 30th Congress, 1847- 
48, as a part of the report of the commissioner of the general 
land office, was sent in response to an earlier request of Dr. 
Jackson. It illustrates the negligence which pervaded the 
superintendence of the public printing at that date. It was 
so badly printed that, according to Col. Charles Whittlesey, 
Dr. Locke repudiated it entirely.* Following is an example 
of the proof-reading which it exhibits. It purports to be a 
list of the "Crustaceous" collected by Dr. Locke : 
Calemens (probably the senaria ofceranrus pleut couried)rex anthems. 
Green. 
Isoletus gigers. 
Isoletus mesistus (mini). 
Asaph us — a large species. 
The report confirms the prevalence of the idea that both the 
iron and all the other ores of the region were in some way de- 
pendent on magnetic currents and could be discovered by the 
use of the dip needle. He refers to a general statement made 
by him, j that his experiments go to show that the general na- 
ture of the subjacent rocks may be ascertained by the mag- 
netic elements, the instrument serving the purpose of a divin- 
ing rod. This idea he considered that his summer's observa- 
tions did not contravene, but he also had discovered that there 
are greater deflections or local. attractions in the northern part 
of Michigan than in other parts of the country. He projected 
a general magnetical chart of the United States, a kind of 
Physical A this. He calls attention to the incompatibility of 
magnetical and geological observations when conducted simul- 
taneously, the former requiring more rapid travel and less ex- 
posure to delicate instruments. He suggests, what ultimately 
occurred, that the iron ore of the Negaunee region would be 
profitably brought to the limestone region of Bay de Noquel 
for smelting. He did not reach the mouth of the "Escanawby," 
owing to his insufficient force for ••packing'* the necessary 
provisions. John Locke, his nephew, was with him. His de- 
scription of "pictured rocks** is interesting, as follows : 
"Magazine of Western History, 1885. 
(Trans. Am. Phil. Soc, April 1!». 1844. 
