OF THE ZODIACAL LIGHT. 



443 



the observed lengths of the main body of the light have 

 already been recorded, omitting the place of the ship, which 

 has been already given : — 



Table II. 



Date. 



Time. 



E.A. 



Decl. 



Length. 



Lat. of apex. 



1862. 



h m 



h m 







/ 



June 18. 



7 P.M. 



10 



17 oN. 



65 5 



+6 30 



July 21. 



7 



12 32 



I oS. 



70 38 



+ 2 34 



26. 



8 



12 32 



3 30 



65 51 



+0 4 



27. 



7 30 



13 



5 



7247 



+ 1 39 



28. 



8 



13 



5 . 



71 50 



+ 1 39 



Aug. 13. 



8 



1448 



II 



84 26 



+ 5 18 



17- 



8 1 5P.M. 



15 16 



17 S. 



78 



+ 1 15 



This small Table, as well as the preceding one, contains 

 remarkable peculiarities besides those already noticed, for 

 which I am unable to account, and which are also shown 

 in the American observations. I allude to the change of 

 latitude of the apex at different times on the same evening, 

 and also to the fact that the axis of the envelope frequently 

 seems not to be coincident with that of the main body of 

 the light. This change of latitude is shown in the observa- 

 tions of the evening of the 27th of August 1862 in the 

 first Table, and the difference between the latitude of the 

 apex of the envelope and that of the apex of the true light ; 

 and that both do not lie in the same plane appears from 

 Table II. In the American observations, both these pecu- 

 liarities are common. Of the first class may be mentioned 

 at hazard the observations represented in plates 3, 7, 62, 

 66, 67, 106, no, 140, 141, 188, notably 201, and still 

 more so 222, where the sign of the latitude is changed in 

 the course of the observations ; and of the second class, the 

 observations in the plates numbered 10, 13, 15, 24, 27, 30, 

 39, and 40. The list of both could be swelled so as to 

 include a large proportion of the plates in the book. This, 

 and deviations of the light from a true figure, which are 

 common, as well as the fact above noticed in the descrip- 



