Notes. Ixxi 
present annual change of variation is about 2’in the Southern and Western 
States, from 3’ to 4’ in the Middle States, and from 5’ to 7’ in the New England 
States.” 
This interesting paper is accompanied with a valuable Magnetic Chart 
of the United States, constructed by Professor Loomis, which ‘is intended to 
represent all the observations contained in the preceding Table reduced to 
the present time.”’ * 
In Europe the great importance of this subject has lately induced the 
d 
Government of Russia, “the classic soil of terrestrial magnetism,’’ as its 
Academicians call it, to order Magnetic Observations to be made, in connexion 
with a general system of Meteorological Observations, throughout the Empire. 
Numerous little observatories have been established in various places, for the 
purpose of beginning a course of these observations. At St. Petersburgh a 
pattern observatory is established, in which a number of officers are qualified, 
by the necessary practical instruction for one and two years, to become 
observers in the small establishments of the interior. Each of these observers 
has two aids, who lodge in the observatory ; a rigorous and uniform system 
is followed, in the distribution of the hours, the selection-of instruments, and 
the methods of observing. Meteorological observations are made eight times 
a day, and, in certain designated places, the Variation and Dip of the magnetic 
needle are also noted at the same times ; the Variation is further observed, 
at certain periods of the year, simultaneously with the observations made in 
other parts of Europe. 
The first part of these official observations has been lately published, 
by the Russian Government, under the title of ‘Observations Météoro- 
logiques et Magnétiques, faites dans l’Empire de Russie, redigées et publi¢es 
aux Frais du Gouvernement, par A. T. Kupffer, Membre de l’Académie des 
Sciences de St. Petersbourg.”’ 4to. pp. 90. 
NOTE H. p. xxiv. 
The following are all the reviews and’smaller published works of Dr. Bow- 
ditch, that have come to my knowledge : 
1. Notice of the Comet of 1807; published in the Monthly Anthology, 
Vol. iv. p. 653. 
* Silliman’s Journal of Science, Vol. xxxiv. p. 290; for July, 1838. 
