1886.] Contributions to the Chemistry of Chlorophyll. 465 







Elliptic analyser. 



Simple analyser. 







tan -zzr. 



I. 



Head- 

 ings. 



I'. 



Read- 

 ings. 





r Natural face. 



-03345 



108° 5-3' 



416 









Same face 

 w polished . . 



-02517 



107 49-1 



384 



— 



— 





"Same face 

 polislied ... 



-02655 



107 49-1 



448 



266° 5-3' 



100 



Ilnd Series. 

 (Elliptic analyser- 



Same face re- 

 polished . . 



The first pol- 

 ished face 

 rotated 

 thro' 4° 27' 



0-02723 

 -03305 



107 52-6 

 107 39-2 



1280 

 960 



265 57-3 



500 



Illrd Series. " 

 (Base of crystal 

 broken up by 



> Natural face. 



-03368 



108 31-4 



384 







Effect of time . . « 



"Polished face 

 Dec. 8 









111 15-7 



40 



• 



Polished face 

 Jan. 20 . . . 









111 16-7 

 111 16-4 



60 

 60 













V. * Contributions to the Chemistry of Chlorophyll. No. 11." 

 By Edward Schunck, F.R.S. Received November 25, 

 1886. 



(Abstract.) 



In this paper the author continues his account of the properties of 

 phyllocyanin, one of the products of the action of acids on chloro- 

 phyll. He shows that by passing a current of C0 2 through an 

 alcoholic solution of phyllocyanin holding oxide of zinc in suspension, 

 a compound is obtained containing zinc and carbonic acid, a phyllo- 

 cyanin zinc carbonate resembling phyllocyanin zinc acetate, but that 

 no analogous compounds containing iron or copper are formed in this 

 way. Attention is directed to the points of resemblance between the 

 double compounds of phyllocyanin containing zinc and chlorophyll 

 itself, particularly as regards their susceptibility to change when 

 exposed to the action of air and light, and it is shown that while 



