blackman: the spermatogenesis of scolopendra. 



85 



Bchnltae, '87 (bana and Triton) : Davidoff, '89 (Distapha 1 Herman,, 

 >89 ,M us,; Macallan,, '91 (Eana and Necturus) j Sonne,,,, 91 

 (Eckinoderi.ta) ; Fick, '93 (Amlotl) ; HoU, 93 (Mas ; Jordan 93 

 . >■ >„., /pi,...,- Mp,7i,er 94 (Salamandra) ; Maealium 



(newt); Mertens, 91 (Pica), Metzner, s» t. /> 



•95 (X -turns, and plant,, Erythromnium and Sptrogyra) Sobotta, 

 £ Ms); Ilertwig '96 (Poisoned eggs of Echinodermata) ; Camoy 

 et Lel,„„, '97 (Amphibia); Eisen, iOO (Batrachoseps) ; Wrtson .01 

 (chemically fertilized eggs of Toxopneustes) ; and Black ma. 01 , .03 

 Sco.opendra). In many of these cases the process was followed , ■ - 

 iderable detail, while in others the condemns are not ->««"; 

 I„ a considerable number of instances the karyosphere conta ns all of he 

 bromatin of the cell, as is shown in the prophase of ■*•* "^ 

 chromosomes are often plainly formed from and employ . 1 of its sub 

 stance Soch a case is found in the egg of Nenfna (Bloebma „, 82). 

 T rtuthor says: - Dass die Elemeute der Kernplatte a„s Thmlstnckcn 

 d Nml olustntstehen, kauu bei uuserem Objekt keinen ZwerMunter- 

 liegeu, da icb alia Uebergangs.ustaude con, unversehr en Noel ta bs 

 z „; a, soehddeten Kernplatte beobach.et babe. \ an Beneden (83), n, 

 "I;.- upon the ovum of Ascaris megalocephala, finds that all be chro- 

 rJtiu is aggregated into one mass, which he calls the " corpuscle germ, 

 „,tif " Kultsehitzky C88) obtained similar results upon A. margmata. 

 H weeer. the observations of other investigators have led to opn.e d, br- 

 ent conclusions and thus cast doubt upon the ember work „th A- n, 

 CarnoVs ('85, p. 207) results upon the arthropods I shaU censor 

 more in detail, as some of his conclusions are based upon a study of several 

 genera of Chilopoda. He divides the nucleoli into four classes as follows . 

 " (a) Lcs nucleate, nucWniens; spherules de nncleme amorphe on .a 

 „, ssee e„ peloton serrc. lis se colorent par le vert de me hy^et - 

 dissolvent dans 1'acide chlorbydriqne concentre, (b If" »» ,e *° 

 vlasmatiaue* ; masses albuminoides reufermant dc la plastme lb de- 

 ! m ™ nco ores sons Faction du vert de methyle, et i.s res,s,e„, a I'nct.on 

 I dissolvants de la nocleine. Ces nueleoles se rencontrent nssez ■ 

 „,ent dans les cellules testiculaires des arthropodes ; cclles des sco.o- 

 ; ires c„ possedent t,n bien marque, (c) Les nuclides nuxtes, qm sent 

 nstitnes p"r la rennion des deux especes precedence* en on corps n» que 

 oh chacune se maintient oependant sous one forme fignrec. (d) Le 

 ZmLw*** on novaux en miniature, renfermant par consequent 

 i: ies element's d'un noyau, veritable ; membrane, portion , ~q,m 

 et portion nucleiuienne. Le type de ces nueleoles nons est ofie.t par 

 Lithobius." 



