7 i2 THE GENERATIVE ORGANS. 



nuclei, and Leydig [344], from observations made on numerous 

 Rotifers, arrived at a similar conclusion. 



Leuckart, in his memoir on the Pupiparae [20] , said, ' We 

 have learned, by a series of observations, that the segmentation 

 nuclei are no new formation, but the descendants of the 

 primitive germinal vesicle. Such observations lead to the 

 belief that there is a specific connection between the first 

 bright spots in the surface layers of the yelk in Melophagus, 

 and the germinal vesicle, yet I am unable to substantiate this 

 opinion by my own observations.' 



Weismann, in 1863 [2] said : ' A germinal vesicle is no longer 

 present as a rule in the freshly-laid egg of the Blow-fly. I 

 have often directed my observations to this and have come 

 to the above conclusion, although in two cases I found a great 

 spherical vesicle in the yelk 88 /z in diameter, surrounded by 



Bibliography : 



359. MULI.KK, JOHANNES, ' Ueber Synapta digitata und iiber die 

 Erzeugungvon Schnecken in Holothurien/ Berlin, 1852. 



360. ROBIN, C., ' Sur la Production du Blastoderm chez les Articulcs.' 

 Journ. de 1. Physiologic, torn, v., 1862. 



361. MILNE-EDWARDS, H., ' Lemons sur la Physiologic et 1'Anatomie com- 

 paree de 1'Homme et des Animaux.' Svo, Paris, torn, viii., 1863-65. 



362. STRICKER, S., ' The General Characters of Cells': 'Manual of Human 

 and Comparative Histology.' Translated by H. Power. New 

 Sydenham Soc , Lond., Svo, vol. i., 1870. 



363. STUHLMANN, F., ' Die Reifung des Arthropodeneies, nach Beobach- 

 tung an Insecten, Spinnen, Myriopoden und Peripatus.' Berichte 

 der Naturf. (lesellsch. zu Freiburg, Bd. i., 1886. 



364. BLOCHMANN, ., ' Ueber die Eireifung der Insecten.' Biol. Central- 

 blatt, Bd. vi., 1886. 



365. MI.OCHMANN, F., ' Ueber die Reifung der Eier bei Ameisen und 

 Wespen.' Festschrift, d. n. Med. Yer. zum 500 Jiihrigen Jubiliium 

 d( r Kuperto Carola. Heidelburg, 1886, pp. 143-172. 



366. FI.K.M.MIM;, \Y., ' Neue Beitriige zur Kcnntniss der Zelle.' Archiv. 

 f. mikrobkop. Anat., Bd. xxix., 1887. 



367. VAX l;i M.DEN ET JuuN, 'La Spermatogencse chez 1'Ascaride 

 Megaloce'phale. 1 Bull. d. 1'Acad. royale de Belgique, 31116 sen, Ixiv., 

 i 



368. Hi .KTWK;, O., l \ r ergleich der Ei und Samenbildung bei Neniatoden.' 

 Archiv. f. m. Anat., lid. xxxvi., 1890. 



The author gives a full bibliography of recent works on this 

 intricate subject. 



