320 T. P. ANDERSON STUART. 



PLATE XLVI. 

 Fig. 1 . Drawings of types of microliths. 

 Fig. 2. ' Granular axiolites/ 



Figs. 3, 4, 5, 6. Sections of ' Ideal Perlitic Surface/ 

 Figs. 7, 8, 9, 10. Conjectural modifications of above. 

 Figs. 11, 12. Perlites from the Meissen Pitchstone, Saxony. 

 Figs. 13, 14, 15. Perlites from the present rock. 



ON GREEN-PRODUCING CHROMOGENIC MICRO- 

 ORGANISMS IN WOOL. 



By T. P. Anderson Stuart, m.d., 

 Professor of Physiology in the University of Sydney. 



[Read before the Royal Society of N. S. Wales, November 7 , 1894.~] 



In the beginning of this year I received from my friend Mr. 

 Charles Binnie of Fordee Station, near Quirindi, a parcel of wool 

 with green patches, and Mr. Binnie asked me to tell him the 

 nature of the discolouration. On submitting the discoloured 

 wool to microscopical examination, nothing could at first be 

 discovered, but at length little highly refracting bodies were seen 

 on the surface of the hair, which led me to suspect that they were 

 micro-organisms of some sort, and at once 1 set about cultivating 

 them if possible. For a long time no success followed, but at 

 length my assistant, Mr. Robert Grant, to whom I am indebted 

 for much careful work in this matter, told me that he thought 

 something was growing on the culture medium. And so it proved, 

 and at length we succeeded in obtaining an abundant crop of an 

 organism which tinted the culture medium with the exact colour 

 of the wool, could be transferred from one artificial culture medium 

 to another, and to normal wool itself, and everywhere produced 

 the same beautiful green pigment, specimens of which are now 



