138 THE AMEBIC AX XATUBALIST « [Vol. LIII 



A few other results rroni ])r(H'(lii)u- Apotciiix females 

 partlienos^enetioally ;irc m the above tables, wliicli 



aKo incliule the M-n-atioii aii.l .m .>^^inu--()vei- in tlie K\ 

 and KM t'eniales shown in the chart. 



b'lirthcr ('i-()ssinii,--()V(M' is indicated in the partheiio- 

 genetic KYZ females (8) and the Mil female (9). The 

 latter indicates more than '11 per cent, oi" crossing-over, 

 but the total crossing-over shown in 296 offspring from 

 MR females, produced both bisexually and partheno- 

 genetically, amounts to only 20, or less than 7 per cent. 

 A few other simple hybrid females, some partlieno- 

 genetically and others bisexually, have produced cross- 

 overs as follows : 



From RY (V,n;,l<.~ 

 From TV Icrnal,-^ 7. 

 From HT t.,,.,!, - IJ" 



There is every indication lhal as the nnnihcrs avail- 

 able become lai-gei- tlicsc pcrct ntauc li^-nrcs will l)e dif- 

 ferent; therefore it sccnis i!ia(l\ isal)h' to project at this 

 time even a tentative (liaurani ilhistrating crossing-over 

 percentages. 



("linssiN.; oVKi; ,N TllK ^\ ^^ .V. 



Crossinu o\,., i,, Ww t-Miiah ^. in paith. no^.-nrlic as 

 well as bisexual rej^rodiict ion. is shown in ihe chart, and 

 tables (1 i>). an.l th. ir ai.- nnniM.m. ,,ih. i ca^. ^ to be 

 presented later in hoth hi>e\ual and i la iM hent •uviietic 

 breeding. While it appejn's tliat the cro>>ov<"rs in the 

 females greatlv exceed those in the males, tile data are 



