of the Earth and the Luminiferous either. 



457 



near six o'clock in the evening. The readings are divisions 

 of the screw-heads. The width of the fringes varied from 

 40 to 60 divisions, the mean value being near 50, so that one 

 division means 0*02 wave-length. The rotation in the obser- 

 vations at noon was contrary to, and in the evening observa- 

 tions, in the same direction as, that of the hands of a watch. 



Noon Observations. 



July 8 



July 9 



July 11 



Mean 



Mean in w.l. 



Final mean . . 



16. 



44-7 



57-4 

 27-3 

 431 



•862 

 •706 



•7S4 



1. 



44-0 

 57-3 

 23-5 

 41-6 

 •832 

 •692 

 •762 



43-5 

 58-2 

 22-0 

 412 

 •824 

 •686 

 •755 



39-7 

 59-2 

 19-3 

 39-4 



•788 

 •688 

 •738 



4. 



35-2 



58-7 

 19-2 

 37-7 

 •754 

 •688 

 •721 



5. 6 



347 



60-2 

 19-3 

 38-1 

 •762 

 •678 

 •720 



34-3 



60-8 

 18-7 

 37-9 

 •758 

 •672 

 •715 



32-5 

 62-0 



18-8 

 37-8 

 •756 

 •628 

 •692 



28-2 

 61-5 

 16-2 

 353 

 •706 

 •616 

 •661 



July 8 



July 9 



July 11 



Mean 



Mean in w.l 



Final mean 



9. 



10. 



11. 



12. 



13. 



14. 



15. 



26-2 



23-8 



232 



203 



18-7 



17-5 



168 



63-3 



65-8 



67-3 



69-7 



70-7 



73-0 



70-2 



14-3 



133 



12-8 



133 



12-3 



10-2 



7-3 



34-6 



34-3 



34-4 



344 



33-9 



336 



314 



•692 



•686 



•688 



•688 



•678 



•672 



•628 



16. 



13-7 



72-2 



6-5 



30-8 



•616 



P.M. Observations. 



July 8 



July 9 



July 12 



Mean 



Mean in w.l 



Final mean 



16. 



1. 



2. 



3. 



4. 



5. 



6. 



7. 

 69-8 



61-2 



633 



63-3 



68-2 



67-7 



69-3 



70-3 



26-0 



26-0 



28-2 



29-2 



31-5 



320 



31-3 



31-7 



66-8 



66-5 



66-0 



64-3 



62-2 



61-0 



61-3 



59-7 



51-3 



51-9 



52-5 



53-9 



53'8 



54-1 



543 



53-7 



1-026 



1-038 



1-050 



1-078 



1-076 



1-082 



1-086 



1074 



1-068 



1-086 



1-076 



1-084 



1100 



1-136 



1-144 



1-154 



1-047 



1-062 



1-063 



1-081 



1-088 



1-109 



1-115 



1-114 



69-0 

 330 

 58-2 

 53-4 

 1-068 

 1-172 

 1-120 



July 8 



July 9 



July 12 



Mean 



Mean in w.l 



Final mean 



9. 



10. 



11. 



12. 



13. 



14. 



15. 



71-3 



71-3 



70-5 



71-2 



71-2 



70-5 



72-5 



35-8 



36-5 



37-3 



38-8 



41-0 



42-7 



43-7 



55-7 



53-7 



54-7 



55-0 



58-2 



.58-5 



570 



54-3 



53-8 



54-2 



55-0 



56-8 



57-2 



57-7 



1-086 



1-076 



1-084 



1-100 



1-136 



1144 



1-154 



16. 



75-7 

 440 

 56-0 

 58-6 

 1-172 



