282 



PROCEEDINGS OP THE AMERICAN ACADEMY 



Mr. Oliver W. Huntington,* to whom we are indebted for the follow- 

 ing results : — 



Crystalline Form of a-CeLORDiBROMACRYLic Acid. 



101 



474 ., 



Triclinic System. 



Forms {100}, {010}, {001}, {101}, {ITO}, J430}, {034}, {304}, 

 {740}, {470}, {474}, {047}? 



P'rom the fundamental angles the following values were calculated : — 



Zonri04°43', Ton ^ 71° 6, Xou^71°10; 



a •.!)■.€ = 0.7981 : 1 : 0.7207. 



010 on 100 

 100 " 001 

 010 " 001 

 100 " 101 

 100 " ITO 

 100 " 430 

 100 " 740 

 010 " 470 

 OOT " 034 



Angles between Norynals. 



Observed. 



G6° 23' 1 

 116° 17' I 

 11G° 20' \ Fundamental angles. 



63° 50' 



70 rj 



47 



27° 



42° 26' 

 21° 



J 



Calculated. 



23° 52' 

 27° 5' 

 42° 36' 

 21° 



In the paper above referred to Mr. Huntington makes the following 



* These Proceedings, Vol. XVIII p. 282. 



