'295 



at Oucle-Pekela (prov. of Groniiigon) on the 30^'' of July last. It 

 was like dark-green glass consolidated with white pumiceous particles. 

 The usually rather homogenous glass contained only comparatively 

 few colourless crystals. 



All these slags correspond, with regard to their general character, 

 with similar products described hy Ch. Velain ^) 



If we may now remind that the ashes of graminae do not con- 

 tain aluminium "), then it is clear, that in their slags we should 

 look in vain for feldspar, unless a compound of aluminium had, 

 during the melting-[)rocess, been resorbed from the soil, and secreted 

 at the refrigeration in the shape of feldspar. 



At last in addition to the above we subjoin a description of a slag 

 owing its existence to a similar event as the one at Igast. On the 

 8^^ of June 1898 a pupil of the gymnasium of the Hague had seen 

 a meteorite in a glowing condition explode in a garden at Voorburg. 



The fragments gathered by him, which 1 owed to the kind- 

 ness of Prof. J. F. VAN Bemmelen, now at Groningen, were 

 likewise nothing else than pieces originating from a swarthy slag. 



1) Etude microscopique des vers resultants de la fusion des cendres de graminées. 

 Bull. Soc. Min. 1. Paris 1878, p. 113—124. 



^) Alois von Hubert. Geschmolzene Heuschlacke. Berichte über die Mittheilungen 

 von Freunden der Naturw. 4. Wien 1848, p.p. 64—66, 



