PLATE 52 



311 



307-309. OxyhemoRlobin of the Muskrat (Filter ziltethicus), showing lozenge-shape. I tabular crystals m 



different orientations and some horsr-typr twins. 

 310-312. Same, showing different kinds of crystal aggregates in parallel growth, arborescent irronpin" 



and sheaf-like forms being produced. 



