204 



As said above, the histology of prosoplasmr.s '^furnishs 

 their most important characteristics* In regard to tissue dif- 

 (833) ferentiation, prosoplasinas do not have the character of arrest- 

 ment forms, but consist of tissue newly differentiated and usu- 

 ally differing strikingly from the normal ones of the ground 

 tissue and often greatly exceeding these in the abundance of 

 their cell forms etc. 



Prosoplasmas differ among themselves aa greatly in regard 

 to structure as to external form. Besides highly complicated 

 forms composed of three, four or fiise kinds of easily distin- 

 guishable tisfsue forms, simple ones may be found which also 

 furnish histologically a transition to katapla^mas; the larger 

 galls especially do not display in all parts structures varying 

 as a\30ve mentioned, from those of the gro^xnd tissue. ' Not in- 

 frequ-ently only the inns r parts are fomed with a prosoplasraio 

 histological character, the peripheral ones resembling kata- 

 plasraas, 



A concentric structure is common to all prosoplasmas. Ho 

 matter if roll-galls, sac, walled or medullayy S^^}^ ^re con- 

 cerned, we find that as soon as several different Jja^^J l^-^^J 

 have b4en fcrraed, they surround the larval cavity as concentric 

 la vprq Further the innermost zone is always formed of a deli- 

 Jl?f tissu^matJrialVrthe outermost of a very firm one In 



the Simplest cases. onlr°JJ4PjgS\iSlue'. ircasll structur- 

 film cuticula. represents this ^^^^^JJ^^S* JJ^nd constructed 

 ally more complicated a peculiar laj^J^lf ^ JJ livers She inner 

 Of sclerotic elements, or j«J«|J,?|X\rsSc^|IllB;- is formed 

 soft part of the tissue - f o^, ^^f??"®^;. those of the adjacent 

 of delicately walled epidermal cells and those of ^^i^^^ .^ 



ffrou&d tissue, whctch are richj^y i^:^*°^ ' "^ >,nvrLprinr the larval 

 S^dullary galls, the i^!?«^!f?^^/?|J^^l end ?icf in cytoplas- 



cavity. are, as %^^lf '.^^J^^?;!!^ L^f juFt Smed give the galls 

 tic substances, tissues of this ^ina ju ^^^^^^ fui-msh 



the solidity necessary for ^^^^^iS^I^'^'^Jl^^ t all tissues, com- 

 the food necessary for *^® J^^lrth? 'other %ur pose".- all othe 

 posing prosoplasmas serve one or the other P^^P^.^.^^ tissue a 



TorLS^i^'tS ti^muftle^^tfa ^^e^tfifef consideration to them. 



in this histological ^-,J^tffirm%'l^t°rhe'same%ha?Sc!" 



sion of external forms, ^^f f !^,^^f ^ ^ ^e proved in the 

 ' teristics found in Prosoplasmas may also oe pr 



^rytich ^i-P^- f?J^,S"lay ? i^ ^^^^ '" " "'-'- 

 Erineura galls a protec-cmg j.o.ir*^^^_ ^, 



■ " 'I'staie^eits ''^^^ f^^^l^^l^^^^^^ 



abundantly in '^^^^12.1^12,2^^1^^^^^ 



only the fol^-o^n^S °?^?..^?oire d galles, Ann. So. Hat. Bo t, 3 



Rech. pour-servir a l'^;?:5"^^L!;erinck. Beob. ueb. d. ersten 



ser.. 1853, T. XIX, p. 273. .^^^^^ Jg^^llen . Amsterdam 1882. 



|^?;ickeluAgsphasen ^i^^f^J^g^^f^SaUenbiidungen. etTJ. Prings- 



Ktoenmacher, Beitr. ^^ ^enntB. d. ^^ii ^^^ Po.okeu, Bech 



helm's Jahrb. f. ^^^^^ ?°** 4 nlr? compare aisS ^Reoh. s. quelqu. 

 anat. b. 1. galles ^ille 1896. ^l^f^^ ^^ 491). Appel. 



Slf^.ich.fg^-^^^^^^^^ 

 1900, Bd. XX, p. 529, 



rs 

 re 



