SYENITE AND PORPHYRY OF NEW JERSEY 



583 



sented as "loss on ignition." As regards the other analyses of the 

 table, the MnO of II is probably too high, and the non-determination 

 of PaOs and TiOa in III of course render the figures for alumina 

 too high. All other analyses of the alkalic igneous rocks from this 

 region we have discarded as unfit for use. 



TABLE III 



I. Nephelite syenite, Brookville, Hunterdon Co., N.J. G. Steiger, anal. Amer. 



Jour. Sci., VIII (1899), P- 423- 

 II. Leucite tinguaite, Beemerville, N.J. J. E. Wolff, anal. Bull. Mus. Comp. Zool. 

 Harvard, XXXVIII (1902), p. 276. 



III. Minette, Franklin Furnace, N.J. L. G. Eakins, anal. U.S. Geol. Surv. Bull. 150 

 (1898), p. 238. 



IV. Ouachitite, Rutan's HUl, BeemerviUe, N.J. J. F. Kemp, anal. Amer. Jour. 

 Sci., XXXVIII (1889), p. 133. 



THE STATUS OF SUSSEXITE 



Brogger, in working out the grorudite-tinguaite suite of the 

 Kristianiagebiet, extrapolated from his analyses of the series, 

 and calculated an end member for the suite, the composition of 

 which is shown in column II of Table IV. No rock corresponding to 

 this hypothetical composition was found in the Kristianiagebiet, 



