680 



SEXUALITY 



group of species shown in Table 7, sexes A, B, and C were called -|-, 

 sexes D, E, and F, — . The three sexes of each type were assigned arbi- 

 trary strengths or valences: A and F were assigned a valence of 3; B 

 and E, 2; and C and D, 1. Copulation was thus held to take place either 



Table 10: System of Mating Relations in Chlaniydomonas hraunii, C. 



dresdensis, and C. eugametos, Summarizing the Observations and 



Interpretations of Moewus, 1937b, 1938a, 1938b, 1939a* 



* The numbers 0, 1, 2, 3 in the body of the table give the intensity of the sex reaction ; = no 

 copulation ; 1 = pairs which form directly ; 2 = preliminary clusters of 10 to 20 cells ; 3 = pre- 

 liminary clusters of 100 or more cells. Percentage cis/Percentage trans = the proportions of the sex 

 stuffs, cis and trans dimethyl crocetin, produced by the garnets. 



between gametes differing in sex (i.e., between any -]- and any — ), or 

 between two gametes of the same sex differing by as much as 2 in valence 

 (for example, between gametes of A and C, both of which are held to 

 be -|-, because A is -f- 3 and C is -\- 1 ) . Similar interpretations were 

 put forth for the mating relations summarized in Tables 8 and 9. The 

 sexes G, H, J, and K were denominated -]- in sex, with valences of 4, 



