712 THE GENERATIVE ORGANS. 
nuclei, and Leydig [844], from observations made on numerous 
Rotifers, arrived at a similar conclusion. 
Leuckart, in his memoir on the Pupiparz [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 
Ee ie vesicle in the yelk 88 » in diameter, surrounded by 
Bibliography : 
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362. STRICKER, S., ‘ The General Characters of Cells’: ‘Manual of Human 
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365. BLOCHMANN, F., ‘ Ueber die Reifung der Eier bei Ameisen und 
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366. FLEMMING, W., ‘Neue Beitraige zur Kenntniss der Zelle.’ Archiv. 
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The author gives a full bibliography of recent works on this 
intricate subject. 
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