( 415 ) 



principally confined to the holes, (aking as appears from the low 

 MgO-quantity, u<> important place in the analyzed rocksample. 



The molecular proportions yield, Fe.,0 ;l being reduced to FeO and 

 the whole being calculated on a sum of LOO: 



SiO, Al s O, FeO MgO CaO Na,0 K a O 

 79.40 10.66 0.66 0.07 2.90 4.81 J. 45 

 the formula according to Osann : 



s A C K a c t' n in k series 



(Osann) 79.46 6.26 3.63 12.66,7.34 7.7 1.73 av 



(Becke) 79.46 6.26 2.90 0.73 12.66 5.86 1.48 (10.0) 



Here we have the rare case that 



Al a 8 > K 2 ( ) + Na s O + CaO -f (Mg, Fe) 0. 

 If, like Osann, we add MgO and FeO in the molecule (MgFe) A1 2 4 to ( '. 

 there remains a rest of 0.77 A1 2 8 ; if however like Becke we neglect 

 the Al 2 O s remainder above (K, Na) 2 -|- CaO, equal to 1.50, then 

 C = 2.90 and F = 0.73. The calculation of a-fc-f- f = 30 yields: 



a c f 



(Osann) 18.99 11.01 — 

 (Becke) 18.99 8.79 2.22 

 In the graphic notation IV denotes the place of the rock; the 

 tilled circle the values after Osann, the not-filled circle the one 

 after Becke. 



Botany. — "Some systematic and phytoyeographical notes on the 

 Javanese Casuarinaceae, especially of the State Herbaria at 

 Leiden and at Utrechte (Contribution to the knowledge of the 

 Flora of Java. N u . III). l ) By Dr. S. H. Koorders. 



§ 1. Casuarina equisetifolia, Forst. 



§§ 1 • Geographical distribution outside J a v a : 

 according to Hook, Flora Br. Ind. V. 598: in British India on the 

 East side of the Gulf of Bengal, South of Chittagong, in the Malay 

 Archipelago, in Polynesia and in Australia, lu the State Herbarium at 

 Leiden I saw, however, also specimens from Madagascar, Mauritius, 

 Bourbon and Senegambia, although it did not appear with certainty 

 from the herbariumlabels, that they referred to uncultivated plants. 

 In Herb. Leiden the species is also represented by specimens from 



! ) Continued from Transactions (Verhandelingen) Roy. Acad. Sciences Amsterdam 

 Second Section Vol. XIV. (1908). W. 4. 



