;J7>> (Berliner Eiituiiiulug. Zeitsclaitl Ud. XXXVIII. ls;i;i. Hott IV.] 



Rejoindcr to Professor Brauer 's: Thatsächliche 

 Berichtigung etc. in the Berl. Entom. Zeitschrift 



XXX vir, p. 487 — 489; 18'J2, 

 bv C. R. Osten Sacken. 



Wlien I receivcd Professor Brauer's, abovc-iiuotcd paiJer, I nuulc 

 up my mind not to reply to it, for the same reason wliioh. tcn ycars 

 ago induced nie to ignore the eleven pages of his „Offenes Sclireiben" 

 etc. (l8bo) directed against nie. Any competent dipterologist wlio 

 will take the trouble to conipare my criticisms with Braner's de- 

 fense, will understand the motive of my silence. 



My purpose at present is merely to publish, with Prof. Miall's 

 permission, a communication contained in one of his letters to nie, which, 

 I think, is conclusive in regard to the principal point in discussion : 

 the Position of the so-called brain of the larva of Chironomns. 



I begin with reproducing the two principal passages concerning 

 the brain-question in Brau er 's: Thatsächliche etc. 



On my very pertinent question (in the Berl. Ent. Z. 1892, j). 463): 

 what particular larvae of his pretended group Eucepliala he had 

 exaniined to ascertain the position of their brain. he answered in 

 a tone of Indignation (1. c): 



„Die Frage Osten Sacken's ob ich denn alle Eucephalcn-Larven 

 „untersucht habe, weise ich zurück, denn sie enthält eine Verdäch- 

 „tigung, die mir unwürdig ist zu beantworten. Ich demonstrirc diese 

 „Punkte alle Jahre meinen Hörern, und habe mich während meiner mehr 

 „als vierzigjährigen Thätigkeit nicht mit Schwindeleien abgegeben." 

 Translation: The (luestion of 0. S., whether I have exaniined all 

 the heads of Eucephalous larvae, I rcsent, because it involves a 

 suspicion which I deem below my dignity to answer. For years I 

 demonstrate these points to my pupils, and for more than forty years 

 of my career I have not been engaged in „Schwindeleien". (I prefer 

 not to translate this cxprcssion.) — Immediately before this passage, 

 Prof. Brauer had said: 



„Wenn Mi all im Kopfe der Chironomns-ljnvxe kein Gehirn 

 „gefunden hat, so bedarf das noch sehr der Bestätigung. Ich halte 



