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Wra. S. Marshall, 



nucleoli he saw connected by a thin thread as if they were dividing. 

 The nurse-cell nuclei he figures with a very thick membrane; each 

 contains many nucleoli and a thick network. Between the nurse- 

 cells and at the margin of their Chamber he noticed a number of small 

 cells which he concluded corresponded to the foUicle cells around the 

 oöcyte. The process the oöcyte sends up between the nurse cells 

 was Seen. He describes the nucleus of the oöcyte as wandering to 

 its distal margin and with this. begins the formation of the deuto- 

 plasm. Division was observed in the follicle cells during the growth 

 of the oöcyte. 



No one has worked with so many dififerent Hymenoptera as 

 Stühlmann (27); in his paper he describes, often very brietly, Vesjm 

 germanica and Vespa media, Boinhus terrestris, Trogits lutorius, 

 Branchus fidvipes, Pimpla sp. (?), Anomalon circumflexum, Lampo- 

 nota sp. (?), Ophion ventricosmn and Ophion luteum, Ephialtes lituratus 

 and Ephialtes sp. (?). Of none of these does he give a very füll account 

 and there is a great deal of similarity in what he says of*the 

 different ones. He describes, for all of them in the early stages of 

 the oöcyte, the formation of the small nuclear-like bodies. In all, 

 the nucleus of the oöcyte goes to the periphery at the anterior end. 

 there around it the small bodies are formed, but not for all at the 

 same age. He says: »Bei den untersuchten Hymenopteren kann 

 also der Austritt der „Ballen" zu sehr verschiedenen Zeiten statt- 

 finden, entweder bei ganz jungen Eiern oder bei ziemlich viel 

 älteren.« These »Ballen« may fuse to form a large »Dotterkern« 

 which lies at the lower pole of the egg; or, as »diffuse Dotterkerne« 

 they may remain separate and generally later become lost or dissolved 

 in the egg. 



What he found, for the first two species of Vespa, was so 

 similar that he gives a Single description for both. In the youngest 

 oöcyte he studied, the nearly central nucleus had a nucleolus; the 

 small bodies near it contained something, but he was doubtful whether 

 or not it was chromatin. He opposes Blochmann's view as to these 

 being »Nebenkerne« saying: »Ich wiederhole noch einmal, daß ich 

 diese Kerne nur für „Dotterconcretionen" halte.« He agrees with 

 Blochmann (3) that deutoplasm is first formed at the periphery and 

 the lower pole of the oöcyte, »am oberen Pol noch eine Plasma- 

 masse bleibt«. At later stages the oöcyte nucleus stains darker than 

 at earlier ones ; it remains at the upper pole until its function here, 

 »die Ausstoßung der Ballen« is ended and then moves towards 



