XV. On the Crystals of Boracic Acid, ^c. 



By W. II. MILLER, Esq. MA. 



FKLLOW OF ST. JOHN's COLLEGE, AND OF THE CAMBRIDGB 

 PHILOSOPHICAL SOCIETY. 



[Read Nov. 30, 1829.] 



As the following crystals do not appear to have been de- 

 termined in any work on crystallo£?raphy, I bejr to offer the 

 Society the results of my own observations vipon them. AH the 

 measurements were taken with the reflective goniometer of 

 Wollaston. 



(Fig. 1.) 



