362 REPORT—1850. 
much more frequent; they will, however, be most effectually se- 
cured by the same arrangements which secure those of the first 
class. 
2. It is ἃ priort probable, that the phenomena (especially those 
depending on prominences from the body of the sun) will not be 
the same when viewed from stations on different sides of the cen- 
tral line of the shadow’s path; and such differences appear, in 
fact, to have been observed in the eclipse of 1842. This considera- 
tion at once suggests the propriety of placing some observers at no 
great distance from the southern boundary of the total obscuration, 
and others at no great distance from the northern boundary. Near 
the centre of the shadow’s path, the picturesque effect of the eclipse 
is the greatest, the phenomena are most symmetrical, and the 
longer duration permits observers to watch the phenomena with 
greater coolness; and here also it seems desirable that competent 
persons should be planted. 
It appears not improbable that some of the phenomena may 
change with a change of absolute time ; and for this reason, as well 
as for eliminating the chances of weather, and for obtaining varia- 
tions of appearance due to differences of climate and of hours of the 
day, it is desirable that observations be made at different points 
along the line of the shadow’s path. 
3. In examining upon a map the course of the shadow in this 
eclipse, it will be seen that Stavanger, Christiansand, Copenhagen, 
Lund, Ystad, Coslin, Thorn, Lowicz, Zamosc, Tarnopol, Kaminiez, 
Odessa, Eupatoria, Gumri, Erivan, are south of the southern boun- 
dary, but probably not so far as to prevent their being used as con- 
venient head-quarters from which an excursion for observation may 
be made: that Bergen, Grimstadt, Arendal, Helsingborg, Cimbri- 
shamn, Bornholm, Kulm, Plock, Warsaw, Lublin, Vladimir, Brody, 
Nikolaiew, Kherson, Perekop, Feodosia, Redut-Kale, Achalzich, 
Schuscha, are within the southern boundary: that Friederichsvarn, 
Goteborg, Carlskrona, Kalmar, Danzig, Ostrolenka, Lomja, Bialy- 
stock, Brest-Litowsk, Jitomir, Machnowka, Lipowez, Uman, Ba- 
brinez, Jenikale, Tiflis, Schemacha, are nearly on the central line: 
that Christiania, Friederichstadt, Ko6nigsberg, Gumbinnen, Augus- 
towo, Grodno, Slonin, Pinsk, Radomist, Kiev, Jelisawetgrad, Ber- 
diansk, Stavropol, Gheorgiewsk, Wladikawkas, are within the 
northern boundary: and that Carlstad, Memel, Tilsit, Krement- 
schug, Ekaterinoslav, Mariupol, Mosdok, Derbent, are at a small 
distance beyond the northern boundary. 
4. Now it appears extremely desirable that, if possible, observers 
should arrange themselves in confederations, each confederation con- 
sisting of three directing-astronomers, who should by concert station 
themselves at three places respectively near the northern boundary, 
near the centre, and near the southern boundary ; these places 
being not very widely separated in the longitudinal direction of the 
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