MODE X1IT. SILICEOUS INTRITE. 



ranked immediately after the parent rock. The 

 primitive porphyries, according to Werner, are 

 those of hornstein and felsite ; to which may be 

 added granitic porphyroid, already described 

 after granite. If a jasper porphyry be found, it 

 must also be admitted. The classical porphyries 

 are unaccountably treated with great disregard, 

 being considered as primitive grunsteins; and 

 the real red porphyry seems as unaccountably 

 omitted. Secondary porphyry includes those 

 with bases of pitch-stone and of clay. The Ger- 

 mans have never been celebrated for clear ideas; 

 and it is truly painful to observe such an utter 

 confusion of important substances in elaborate 

 systems, while the most trifling objects are elu- 

 cidated with infinite patience and assiduity. 



Turpe est difficiles habere nugas, 

 Stultus et labor ineptiamm. 



STRUCTURE I. KKRAL1TE PORPHYRY. 



The keralite is generally reddish or greenish. 

 It is sometimes said to form mountains in Siberia 

 and other countries. 



