8. Abstammungslehre. 537 



1500) Laguesse, E. (Faculte de Med. Lille), Examen de deux pancreas 

 de Lapin trois ä quatre ans apres la resection du canal. 



(Compt. Keud. Soc. de Biologie 70,20. p. 910—912. 1911.) 

 Chez ces deux Lapins le pancreas offrait les memes caracteres essentiels: 

 transformation en une logue et large coulee graisseuse s'etendant de l'anse 

 duodenale jusqu'ä la rate et disparition de la glande exocrine; les ilots de 

 Langerhans seuls avaient persiste. Or ces deux animaux n'ont jamais 

 präsente de diabete. E. Faure-Fremiet (Paris). 



1501) Friedemann, M. (Patholog. Inst. Rostock), Über Mäuseblastome. 



(Virchows Archiv 205,1/2. p. 154—166. 1911.) 

 850 Transplantationen von Mäusetumoren verschiedener Herkunft. Bei 

 partieller Exstirpation der Geschwülste traten Rezidive auf. Aber auch bei 

 vollständiger Operation rezidivierten die Tumoren in etwa 60 Proz. der Fälle. 

 Makroskopische Metastasen konnten nie gesehen werden. Im Gegensatz zu 

 Ehrlich s Theorie der atrep tischen Immunität gewann Verf. durch seine Ver- 

 suche den Eindruck, daß bei den Mäusen, die bereits einen Tumor hatten, 

 ein zweiter, zuweilen auch ein dritter mit größerer Sicherheit anging, und 

 daß bei gleichzeitigen Doppelimpfungen beide Tumoren sich besonders schön 

 entwickelten. Ceelen (Berlin). 



8. Abstammungslehre. 



(Siehe auch Nr. 1346, 1399, 1402, 1419, 1442, 1451, 1457, 1476, 1480, 1486, 1491, 1492, 



1493, 1499.) 



1502) Maudei'S, N., An Investigation into the Validity of Müllerian 

 and other forms of Mimicry, with special reference to the Is- 

 lands of Bourbon, Mauritius and Ceylon. 



(Proc. Zool. Soc. 3. p. 690—749. 1911.) 

 The writer describes observations on the habits of insectivorous birds 

 and lizards in the three islands, giving a list of all those which might be 

 effective in bringing about mimetic resemblance. He also describes experi- 

 ments on feeding birds and lizards with butterflies which are supposed to be 

 unpalatable or mimic such species. The account is very füll and detailed, 

 and unsuitable for summary. The author's conclusions are as follows: — 

 „1. It has been shown that in Bourbon and Mauritius there are no butterfly- 

 eating birds or reptiles; so that cases of mimicry occurring there cannot be 

 due to their influence. 2. In Ceylon it has been conclusively shown that the 

 butterfly-eating reptiles are impartial feeders. 3. That a trained observer can 

 distinguish the majority of these mimetic butterflies at a distance of about 

 twenty or thirty feet, and frequently at the same number of yards; and this 

 being so, it is certain that a bird which has to depend for its existence on 

 its powers of Observation, could after a few failures be able to discriminate 

 them at the same and probably at a considerably greater distance. 4. That 

 Drongos feed largely upon Euploeas, and this being so, a Papilio mimicking 

 them obtains no protection in the vicinity of these birds. 5. There is no 

 bird in Ceylon known to eat butterflies that distinctly discriminates as an 

 adult between one species of butterfly and another. 6. It has been shown 

 that there is a great destruction of butterfly life in the dry zone, and that 

 here, if any where, Müllerian or Batesian mimicry might be induced, but 

 the destroyers are largely migratory and their attacks not selective. 7. Tbat 

 the number of broods of butterflies which occur between the termination of 

 tasting experiments in one year and the commencement of them in the next 



Zentralblatt f. allg. u. exp. Biologie. II. 36 



