434 On the Factors Concerned in Agglutination. 



of the non-specific substance. The deficient in non-specific substance can 

 be made up by the addition of a globulin solution obtained from normal serum. 



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Colour -Blindness and the Trichromatic Theory of Colour Vision. 

 Part III. — Incomplete Colour- Blindness. 

 By Sir W. de W. Abney, K.C.B., F.K.S. 



[This paper is published in Series A, vol. 86, No. 583.] 



