Condensation, and on the contrast of Colors. 



89 



outset, the volume of each precipitated water particle is T/10 12 

 cub. cm. and its linear dimensions 2/10 4 cm. 



Finally, if in JY = 10" (I+W)1 °^, y be computed as the ratio of 

 densities at p, 0, and p\ #', then y = -916 ; and since 1+bt = 

 1-35 for t=3'5 min., JY = 10~' 512 ". In this way the values 

 marked i^in Table III were computed. 



Discussion. 

 8. Color sequences. — The coronal center which corresponds 



Table III. — Axial and Coronal Colors seen in the Drum. 

 y = -916; t = 3"5 m ; b = -I; Exhaustions 76-68 cm . 

 First Series. Second Series. 



Exh 



. Axial 



Coronal 





Axial 



Coronal 



N 







No. 



color. 



center. 



Time. 



color. 



center. 



Time. 



Nx 10 3 



fyl/N 







— 





— 







39 m 



1,000 



1-00 



1 



— 





— 



Viol-bl 



Fog 



41 



889 



1-04 



2 



Bl 





27 m 



Bl 



a 



44*5 



790 





3 



Bl 





31 



Bl 



u 



48 



702 





4 



Bl-gr 





35 



Bl-gray 



Colorless 



i 51-5 



624 





5 



Bl-gr 





38 



Yl-^r 



u 



55 



555 



1-22 



6 



Gr-yl 





41 



Gr-Yl 



a 



58*5 



493 





7 



Tl 





45 



Yl 



Olive-gr 



62 



438 





8 



Yl-or 





48 



Or 



u 



65*5 



389 





9 



Or 



Olive gr 



52 



Or 



u 



69 



•346 





10 



Or-rd 



— 



56 



Or. rd 



u 



72*5 



308 



1-48 



11 



Rd 



Gr-yl 



59 



Prp 



Gr-yl 



79 



273 





12 



Viol-rd 



— 



63 



Prp 



Gr-yl 



79"5 



243 





13 



Yiol 



Or-yl 



66 



Yiol 



Yl 



83 



216 





14 



Yiol-bl 



Rd 



70 



Yiol-bl 



Or-rd 



86*5 



192 





15 



Bl-gr 



Prp 



73 



Yiol-bl 



Rd 



90 



171 



1-80 



16 



Bl-gr 



Prp 



77 



Gr 



Prp 



93-5 



152 





17 



Gr-yl 



Prp 



80 



Yl 



Prp 



97 



135 





IS 



Yl? 



Gr 



84 



— 



Wh viol 



100-5 



120 





19 



Prp 



Yl-gr 



87 



Yiol ? 



Gr 



104 



106 





20 



— 



Or-rd 



91 



Yiol 



Yl gr 



107*5 



95 



2-19 



21 



— 



Gr 



94 



— 



Or-rd 



111 



84 





22 



— 



— 



— 



— 



Prp 



114-5 



75 





to the first axial blues and blue greens of Table III is not 

 determinable as to color in the drum. In the globe it was 

 seen to be a diffuse red-rimmed tawny fog. The first pro- 

 nounced contrast which appears is the orange-red axial color 

 and the blue-green or green-blue field. This is usually easily 

 obtained and is complimentary in character. The axial colors 

 then move toward the violet and the field colors toward the 

 yellow. After this .the axial colors are already nearly white; 

 the tinge of color is so faint that it would be hard to recog- 



