No. 512] 



NOTES AND LITERATURE 



of the expression "typical," as used by Mr. Coll 

 to my question, he writes that in every ease i 

 black form, tail h 'ajn sti us or phi mix a." 



(3) rufa, a red variety. The reddest for 

 continent of Europe. The above three ha v. 

 colorous, though the foot fringe may vary. 



(4) albolateralis, with the back black and th' 

 two colors sharply separated. A very bane 

 restricted range, especially common in Wale- 

 writes me that the specimens he used were fou" 

 of Birmingham. 



(o)scharffi, like albolateralis, but the sides 

 white. 



In the first experiment, casta))* a was paired 

 former laid 39 eggs, of which 24 were hatch 

 maturity. These proved to be: 12 ater (with 

 in foot fringe), 10 rufa, 2 castanea. From "" 

 paired with castanea, and gave 14 in the ne 

 which four were ater, eight rufa and two caster 



From the pairing of two of the eight rufa, 

 raised, eight being rufa, two ater, and five 

 castanea. (Mr. Collinge does not explicitly 

 but in a letter he confirms this interpretation 

 From the pairing of two rufa of the last general 

 were raised, twelve being at< r. two subvarieties 

 subvarieties of castanea. Thus the experime" 

 F 4 , with results which are thoroughly Mendel 

 segregation of characters noes, but difficult to e 

 to the appearance and proportions of the diff 

 will be noted that rufa was twice chosen for 

 exclusion of the other varieties, and the seconc 

 more black slugs than the first. None of the 

 appeared. 



In a second experiment two albolateralis we 



extraordinary that I asked Mr. Collinge parti, 

 and he confirms the result as stated. C 

 lateralis to be homozygous, but the expe 

 either heterozygous (in which case the propor 

 explain) or the results are incapable of ex 



