of the Total Eclipse. 155 



structure on a most stupendous scale, and perhaps of corre- 

 sponding importance), that it seems highly desirable that the 

 arrangements for observation should be planned with espe- 

 cial reference to them. For the observation of the pheno- 

 mena of the other classes, the opportunities (though abso- 

 lutely rare) are much more frequent ; they will, however, be 

 most effectually secured by the same arrangements which 

 secure those of the first class. 



2. It is d priori 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 central line of the shadow's path ; and such dif- 

 ferences appear, in fact, to have been observed in the eclipse 

 of 1842. This consideration 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 variations of appearance due to differences 

 of climate and of hours of the day, it is desirable that obser- 

 vations be made at different points along the line of the sha- 

 dow'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, 

 Tamopol, Kaminiez, Odessa, Eupatoria, Gumri, Erivan, are 

 south of the southern boundary, but probably not so far as 

 to prevent their being used as convenient head-quarters from 

 which an excursion for observation may be made : that Ber- 

 gen, Grimstadt, Arendal, Helsingborg, Cirabrishamn, Bom- 

 holm, Kulm, Plock, Warsaw, Lublin, Vladimir, Brody, Nik- 

 olaiew, Kherson, Perekop, Feodosia, Redut-Kalc; Acbalzich, 



