38 FORESTRY IN SPAIN. 



given to those which enter into the composition of the 

 rocks and the soil found in forests. 



For use in the study of geologic mineralogy the school 

 possesses two collections : one chrystalographic, the other 

 rnineralogical. 



The chrystalographic collection is composed of 336 

 models in plaster of Paris, formed and arranged according 

 to the system of Naumann, and containing in each 

 chrystaline system representatives of its typical holoe'dric 

 and hemie'dric forms, and of the more remarkable combi- 

 nations of one form with another, &c. 



Double crystals, or hemitropes and anomolous and 

 imperfect forms : there are in this collection crystals and 

 models representative of the fundamental forms of the 

 recognised systems of these, and of their primary deriva- 

 tion. 



The rnineralogical collection contains 770 specimens, 

 each of which is representative of a type, a variety, or a 

 different locality. It comprises 175 distinct species, 

 amongst which are representatives of the 15 classes of 

 Naumann, on whose system they are arranged ; there being 

 largely represented the classes 1, metallic oxides; 3, 

 haloids ; 5, geolites ; and 6, anfoterolites ; these being 

 considered the most important for study in the career of 

 a forest engineer. 



And for instruction in geology this museum contains, 

 as important auxiliaries, a petrographic, and also a 

 palseontological collection. 



The former is composed of 800 specimens of rock, of 

 which the greater number are Spanish, and some are 

 French, representing the most varied types and varieties 

 of the principal species found in the Peninsula. 



The collection of fossils consists of 1200 rpecimens, 

 classified according to different characters of ground, after 

 the method of d'Orbigny, and bringing together types of 

 the most characteristic species of all of these. The total 

 number of species represented is about a thousand. 



