Lovering and Bond on Magnetic Observations at Cambridge. 13 
vember was selected, in which observations were to be made at 
every five minutes during the 24 hours. These are the present 
German Magnetic Term-days. In this advanced stage of the 
research, Humboldt addressed a letter to the President and Coun- 
cil of the Royal Society, soliciting the countenance and support of 
the British nation; and this appeal, after having been met in the 
most prompt and generous manner at home, was sent abroad to 
various Academies and men of science in this country. The extent 
and important magnetic position of America were insisted upon in 
the appeal sent out to it, and it is to be wished that the example set 
by the magnetic Observatory in Philadelphia, under the care of Pro- 
fessor Bache, and by the American Academy of Arts and Sciences 
in Boston who have supplied the Cambridge Observatory with the 
requisite instruments, will be a motive to our government and to 
individuals to take measures in this matter worthy of their wealth 
and energy, as well as the eminent local advantages which they 
enjoy in regard to this scientific investigation. 
The following table, from page 38 of the Report of the Royal 
Society, is published here for the information of those who have not 
seen the original. 
Days of Commencement of the Terms of simultaneous observation, 
during the years 1840, 1841, and 1842. 
Month. 1840. 1841. 1842. 
January W ednesday 22 W ednesday 20 W ednesday 19 
February Friday 28\ Friday 26| Friday 25 
March . |Wednesday 18 Wednesday 24\W ednesday 23 
April Wednesday 22)W ednesday 21|Wednesday 20 
May . . |Friday 29 Friday 28|Friday Q7 
June Wednesday 24|W ednesday 23)/W ednesday 22 
July . . |Wednesday 22 W ednesday 21, Wednesday 20 
August Friday 28 Friday 27\Friday 26 
September Wednesday 23 W ednesday 22 W ednesday 21 
October Wednesday 21 Wednesday 20|W ednesday 19 
November . Friday 27|Friday 26 Friday 25 
December W ednesday 23) W ednesday 22|W ednesday QI 
