THE SUNS MOTION IN SPACE. 



217 



(130) References in Popular Science Journals. — In general no 

 trouble has been taken in regard to references to the subject of 

 solar motion in popular science journals : the following brief lists 

 however contain such references as I have noted in "Nature" and 

 "The English Mechanic." 





"Nature." 







Year Name. 



Vol. Page. 





Year. 



Name, Vol. 



Page. 



1884 Plummer 



29 246 





1890 



Boss 41 



548 



1885 Groth 



31 215-6 





1890 



Stumpe 43 



90 



1886 Homann 



33 450-1 





1891 



„ Clerke 44 



572-4 



1886 Kovesligethy 



34 131 





1892 



Porter 47 



41 



1886 Ubaghs 



34 158 





1893 



Risteen 48 



208-9 



1887 Ubaghs 



36 45 





1893 



Bakhuyzen 48 



401-2 



1890 Eastman 



41 351 





1895 



Pannekoek 52 



135 





"English Mechanic 



■>■) 





Year. Vol. Page. 



Year. 



Vol. 



Page. 



Year. Vol. 



Page. 



1866 2 371 



1871 



12 



444 



1885 41 



562 



„ 389 



1871 



14 



25 



1891 54 



175 



1867 5 43 



1871 



14 



49 



1897 65 



528 



1871 12 417 



1880 



31 



5 







(131) Tabulated Results. — In order that the whole biliography 

 of the subject, and the results obtained by the various investigators 

 may be readily examined, a synopsis has been given in Tables I. 

 and II., the former containing the literature preceding the first 

 numerical estimate of the direction of the motion, the latter the 

 literature from that first estimate onwards. In order that these 

 results may be immediately comparable, it was necessary that 

 they should be reduced to a common epoch. For this purpose 

 the date 1900-0 was selected, and each value has been corrected 

 to that date. It has not always been possible to ascertain with 

 certainty the date for which the values are assigned in the different 

 estimates : the difficulty has occurred to every one who has con- 

 sidered the matter, and is a fact is to be regretted. The uncer- 

 tainty is indicated by a query mark. In order to facilitate the 

 reduction, Table III. was prepared, which gives the precessional 



