PLATE 4 





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23 



19, 20. Reduced HeinoKloliin of the Shad (.!/((/ sniiiilisxinut). slio\vin>r siniple crystals. 



21. Oxyhemoglohin and Methemoglobin of the Shad, slimvintc li:i>al aspect of regular growth. 



22. Oxyhemoglobin and Methemogloliin cif the Shad, showing edge aspect cit a crystal ol oxyhemo- 



gliibin inclosed by methemoglobin in regular growth and twinned. 



23. Oxyhemoglobin and Methemoglobin of (he Sliail. sliowing the two substances crystallized separately 



and also in regular growth. 



24. Reduced Hemoglobin and Methemoglobin of the Shad, showing separate crystals, not in regular 



growth; also prismatic cleavage of reduced hemoglobin. 



