IM.VI.Lf ;PMENT OF EGGS OF AK1:\< I A AND CH.ETOPTERUS. 289 



As s.ho\vn in tin- aliove taMe, all of the stronger solutions of 

 .iini(|o-.K ids that \\riv ti-ed had much tlu- same effect on l>oth 

 kinds of ei^s expcrinieiiii d upon. |>ut several ot" tin- weaker 

 solution-, had a much more pronounced action on the- c--s of 

 ('l\<ilo|>lcrn^ than on tlm-i- of Arlmcin. \\"cak solutions of 



leucin, <,f asparagine and of alanin accelerate the de\el- 



opment of tin- eggs of < V:,, toptt'ru* to a noiiceaMc extent, yel 

 none of tlie-r -olution- ha\r .ip|.in.-ntly an\ i-lii-ci on ihc rarl\ - 

 d-\ i-lopini-nt of th< of Arhaiiti. Tin- egga oi ''interns 



aniioi segmenl at all \\hcn |ilaci-d in a ,',, ]>rr 11 ni. solution of 

 asp.irtic acid, although this -oluii"ii pcnnii- tin !' Arhncin 



to dt-M'lop to the- Ma-tula Staj 



'I'hf ahiionnalitifs produced in th- . of Ar ! ><:>-i<i and of 



'terns by various solutions of amido-ai id- consist i hictl\- 



of po|\ spcTiny, irn-v:ulariti> in ihc mitotic li-un--. \arialiK- 



and a fu-i<>n of -.-\rral t-mln-xo- into ijani form-. No 



i-ml'iAo^ \vcrc found that -ho\\<d rillu-r tlu- lar\al i liaract-r- 



istic- of other forms or marked peculiarities- of structure that 



mi-lit hi- attriliuted to the s|,,-cit'u- action of the solution in 



\\hich they were reared. 



The result- obtained in the-e e\perinienls indicate th.it -olu- 

 tioiis of amido-acids can alter the rate at which tli %& of 



add and of ('/'.,, !u/>tt'rits di'\i-|op. but that they have no 

 inlhieme \\hate\er in determining the character of the develop- 

 ment, \\lien the eggs experimented u|'oii are in a normal physic- 

 al condition. 



Ill l-RAfL'RE CITKD. 

 Hertwig, O. und R. 



'87 I eber h-n Befruchtungs- und Teilungsvorgang ci hen Eies unter 



di-iu Kintli. Xgfn/it-n. Jen. Zeitsihr. Nati:r\\i--., B<1. XX., 1887. 



Lillie, F. R. 



'02 Differentiation without Cleavage in the Egg of the Amn-li<l. Chatopterus 



Arch. Kntuicklungsmech., Bd. XI\"., 1902. 



