Analysis o/'Mr Barlow's Essay on Magnetic Attractions . 261 
Accipitres. 
Falco albicilla 
F. fulvus 
F. milvus 
Falcones tres incog. 
Coraces. 
Corvus corax 
Corvus cornix 
Cuculus canorus 
Corvus frugivorous 
occasional 
Passer.es. 
Alauda arvensis 
Alauda pratensis 
Sturnus vulgaris 
Sturnus cinclus 
T Urdus pilaris 
T, iliacus 
T. musicus 
T. merula 
Emberiza nivalis 
E. schoeniclus 
E. calandra 
Fringilla linota 
Motacilla modularis 
M. troglodytes 
M. alba 
M. flava 
M. rubetra 
M. oenanthe 
Hirundo riparia ? 
Gallinae. 
Tetrao attagen 
T. lagopus 
Columba oenas 
G RA LL^. 
Ardea cinerea 
Scolopax arquata 
Sc. phoeopus 
Sc. rusticola 
Sc. gallinago 
Sc, gallinula 
Sc. glotti 
Sc. calidris 
Tringa vanellus 
T. morinella 
T. alpina 
T. cinclus 
Charadrius hiaticula 
Ch. calidris 
Ch. pluvialis 
Haem a top. ostralegus 
Fulica atra 
F. chloropus 
Rallus crex 
R. aquaticus 
Anseres. 
Sterna hirundo 
Colymbus grylle 
C. troile and minor 
C. septentrionalis 
C. arcticus 
C. stellatus 
C. glacialis 
Larus rissa 
L, hybernus 
L. canus 
L. cinerarius 
Lo naevius 
L. marinus 
L. ridibundus 
L. parasiticus 
Procellaria pelagica 
P. glacialis 
Pelecanus carbo 
P. graculus 
P. cristatus 
P. bassanus 
Anas cygnus 
A. nigra 
A. anser 
A. erythropus 
A. bernicla 
A. boschas 
Mergus serrator 
Alca arctica 
A. pica 
A. torda 
Anas mollissima 
A. clypeata 
A. glacialis 
A. crecca 
Art.— -III. Analysis of Mr Barlow’s Essay on Magnetic At- 
tractions. 
In our number for October 1819? we gave a brief sketch of 
the results of a series of very interesting magnetical experi- 
ments, carried on at the Royal Military Academy, by Mr 
Barlow. An account of these experiments has since been pub- 
lished, under the title of an 44 Essay on Magnetic Attractions.” 
It appears that the apparatus which Mr Barlow employed for 
conducting this course, consisted, first, of a solid iron-ball, of 
nearly 13 inches diameter, weighing about 288 lb. This was 
suspended by a system of pulleys, which enabled the experiment- 
er to raise or lower it at pleasure. Immediately under the ball 
was placed a strong, firm, round table, about 5 feet in diameter, 
