of Contents. ** 



';^ 



APPENDIX. 



PAGE 



CALCULATION OF THE LAWS OF DFCREMENT 253 



How to determine the decrement from the mea- 

 sured angles of the crystal 293374 



How to determine the angles when the law of 



decrement is known 374 378 



Application of the proposed method of calcula- 

 tion to a particular case 378 392 



ON THE DIRECT DETERMINATION OF THE LAWS OF DE- 

 CREMENT FROM THE PARALLELISM OF THE SECONDARY 

 EDGES OF CRYSTALS . 393 



METHODS OF DRAWING THE FIGURES OF CRYSTALS 402 



ON MINER ALOGICAL ARRANGEMENT , 439 



ALPHABETICAL ARRANGEMENT OF MINERALS WITH THEIR 

 SYNONYMES AND PRIMARY FORMS 451 497 



TABLE OF PRIMARY FORMS ARRANGED ACCORDING TO 

 THEIR CLASSES ,,....., 498 501 



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