is'..: 



1894.] Contributions to the Chemistry of Chlorophyll. 351 



crystals of a mineral somewhat resembling ottrelite have been de- 

 veloped ; a conglomerate, the matrix of which is rather altered, as in 

 the case of certain " Huronian " conglomerates, and a black-garnet 

 micaceous schist, exactly resembling a rock which occurs in the 

 Lepontine Alps at various localities from the neighbourhood of the 



; Lukmanier Pass to the Binnen-Thal. Several of the schists resemble 



' those which occur in the " upper schist " group (as defined by one of 

 the authors) in the Alpine chain. Certain rather fine-grained 

 speckled gneisses resemble a vaiiety of that rock common in the 



\ Blair Athol district (Scotland). 



Among the minerals or vein-specimens, the most interesting is one 



; which presents some resemblance to jadeite. Microscopic examina- 

 tion shows it to consist of an aggregate of minute minerals, very 

 difficult to distinguish, and chemical analysis suggests that the most 

 probable are lime-garnet, jadeite, saussurite, or an allied mineral, 

 and a pyroxene. As the specimen was collected from a moraine, its 

 origin is conjectural, but that it was a vein-specimen seems most 

 probable. 



The minerals (among others) are actinolite, garnet, idocrase, noble 

 serpentine, pyrite, and copper ores. 



The geographical distribution of the rocks is described, and it is 

 shown that in these mountains, as in the Alps, remnants of sediment- 

 ary rocks, probably of more than one geological era, are folded in 

 among great masses of crystalline rocks, some, doubtless of igneous 

 origin, but others metamorphosed sediments. It is evident that here, 

 also, the rocks, as a rule, have been greatly modified by the effects of 

 earth-movements. 



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

 By EDWARD SCHUNCK, F.R.S. Received February 15, 1894. 



My previous papers were devoted to a description of various 

 products derived from chlorophyll and their qualitative reactions. 

 In the present communication I propose to give an account of some 

 experiments made with a view to ascertain the composition of some 

 of the derivatives of chlorophyll previously described. 



Considerable difficulty was experienced in obtaining quantities of 

 the various substances in a state sufficiently pure for analysis. This 

 was especially the case with phyllocyanin and phylloxanthin, which, 

 by the methods of purification employed so far, cannot be obtained 

 entirely free from fatty matter. No attempt was therefore made to 

 determine their composition. Of the compounds of phyllocyanin 

 there is one, the phyllocyanin cupric acetate, which crystallises well, 

 and has the appearance of a definite compound. Its composition was 



