332 



(b) The determinatioa of the value of morpho- 



logical characters of the orders, genera, and 

 species of plants, as suggested by one of us (24). 



(c) On the improvement of methods for testing the 



interaction of antigen and antiserum by the 

 deviation of complement. 

 References.— 



1. Cramer, Journ. of Physiol., xxxvn, p. 146, 1908. 



2. Bordet et Gengou, Ann. de l'Inst. Pasteur, xv, p. 143, 



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xxviii, p. 237, 1900. 



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6. Leblanc, La Cellule, xvm, p. 337, 1901. 



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10. Nuttall, Blood Immunity and Relationship, Cambridge, 



1904. 



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Jan., 1906. 



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Lxxvni, p. 297, 1906. 



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lxxx, p. 161, 1908. 



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1910. 



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17. Adami, Principles of Pathology, Vol. I, p. 483, Phila- 



delphia and New York, 1908. 



