Notes on the Life of Arago. 51 



or more ova.* For out of the contents of the ovisac a yelk 

 arises around each germinal vesicle, and then a vitellary 

 membrane (" zona pellucida n ) around each yelk. This, as 

 already said, explains the presence occasionally, not only of 

 several ova in a Graafian follicle, but also of more than one 

 " yelk " (ovum) in the Bird's " egg." 



Notes on the Life of the celebrated Dominique- Francois -Jean 

 Arago, Perpetual Secretary of the Academy of Sciences, 

 Member of the Board of Longitude, and Grand Officer of 

 the Legion of Honour, §c. §c.\ 



The death of Dominique-Francois- Jean Arago has cast 

 a gloom over the city; and the announcement of this melan- 

 choly result, which we deplore and record with sadness, was 

 received with a heavy, heartfelt regret by his fellow-citizens. 

 The last of one of the bright ornaments of the true old school 

 of science is now no more. The philosopher, the man of 

 of science, the friend of truth, the judicious and wise coun- 

 sellor, has left this earth full of years and full of honours, 

 having devoted a life of fifty years with a steady determina- 

 tion to improve his country, and to advance his fellow- 

 creatures. Never during this long period has he allowed his 

 activity to be interrupted, nor has he ever flagged or even re- 

 coiled from anything that remained to be done. The lofty aim 

 of the departed philosopher was ever to unfold the wonder of 

 Divine skill, and to develop the laws of Divine government. 

 His immortal writings will shed a light on the paths of science, 

 as long as the world is governed by the same laws. 



It is our office to give ' ; honour due" to all such manifes- 

 tations of intelligence; and whilst endeavouring to shew the 

 extent to which the mental powers of M. Arago were effec- 



* An instance of this, met with in the ovary of a Bird, shewing two young 

 germinal vesicles about to be included in the same ovisac (and thus to explain 

 the presence of two " yelks " in the Bird's " egg,") will he found in the Phil. 

 Trans, for 1841, Part ii., Plate 25, fig. 165, in the only body in this figure 

 not marked by a letter. 



t From the Athenceum, Quarterly Review, Commonwealth Newspaper of Glas- 

 gow, and Comptes Rendus, 



d2 



