82 J. Rei.ixvaax — DocTRHS V. Lketwrx 



tlie eji«i' of tlic circulans-wasp is i>l:ic('(l in tlic wiiitcrbiul. Tlic v<x}x 

 (*;iii;il .ii<K's tln'()n<iii the hase of a nouii.u' Icaxc and the cu-.u' itself is 

 put into tlie lower part of a scciiiidaiy bud. Tlie .^all iìvows out of 

 the l)ase of the l)nd and this i-eniains unaltered at tlu' side of the .üall. 



The hnds in wiiieh tlie circulans-e.u.us are i)hiced, ]»i(»(luc(' in tlie 

 summer the very li,üht-eohmred branches. .Vnd it is of a s])ecial inte- 

 rest, that the fi'alls, which apjtear some time before the devellopment 

 of the snmmerbranches, have the same coloured surface as the leaves. 



It is in the first ])laee clear, that it is a character of this oak- 

 variety to jtroduce in the early sumnu'r the dark aiul in the later 

 snmmer the li^ht leaves and not (»nly under the influence of exter- 

 nal circumstances. 



It is also clear, that the losin.^- of the characters, which form in 

 the cell the chloro]»hyl-c(»lourin<i', is not only in the cells, which later 

 form the surface of the lea\"es. but that the cells of the ,i>all, which 

 take their ori.uin out of the l)ase of the bud. a point wliich will n<'ver 

 i>ive rise to a leaf. ha\(' also the same chaiacters as the leave-cells 

 itself. 



It is a new proof of the fact, tliat in the .uall are the same cha- 

 racters as in the normal plant, but it is also of importance, that du- 

 rin«' the growth of this i>all , it a]>]M'ars. that the cells, which have 

 a wholly other function, have the same characters, but in anothei- 

 combination to each other. 



If the cell nets into a chan.ü<Ml condition, as wherefore it was de- 

 stined, the coml)ination of the charact<'rs alters and thos<' which were 

 firstly latent are activated : in tliis case the cliaracters which arc ne- 

 cessary to the cohairini;' of the chroinato|)hores. 



