PLATE 28 



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163 



164 



168 



163. fl-Oxyhemoglobin of the Mule (A'i/w/i.s <IMH* /,'</ .- iclmlliif: ), slid \\ing a, large single crystal. 

 1114. Same, showing large horse-type twin with coinpcisilicm face normal to base ami inclinliii 

 ]irisin-l)ase edge. 



165. Same, showing large horse-type twin in various aspects. 



166. Same, showing smaller horse-type twins. 



167. Same, showing large elongated horse-type twins, 

 liis. Same. shouiiiL' large horse-type twins. 



