ADDinONAI. COMMKNTS ON THE 0ROI,0O\- OF 1 HK JUAN FF.RNANDKZ ISI.AN'DS 69 



Fig. 28. High-temperature ex5olution of spinel, enclosed in oli\ine phenocryst PI. 1, Fig. 2. Light 

 lamellae, according to Ramdohr probably magnetite in groundmass of excess spinel, x 600. 



Photo P. Ramdohr. 



Fig. 29. Magnetite in groundmass of the lava bed as seen in PI. I, Fig. i partially changed to 

 hematite martite '. x 300. Photo P. Ramdohr. 



5 — 516795 The Sat. Hist, of Juan Fernandez and Easter Isl. Vol. I. 



