Commandant E. le Puillon de Boblaye. 199 
members during the year 1832 and1833. Atthe extraordinary 
meeting at Alencon, in 1837, he presented a geological map 
he had marked the heights at which the various formations 
come in contact. The map was accompanied by a sheet of 
sections, indicating the relative position of these forma- 
tions, and the configuration of the surface : it is to be regret- 
ted that this work was never published. It was at the close 
of the meeting at Alengon, that the celebrated Buckland, 
while returning thanks to the officers of the Society, ex- 
pressed the esteem which he and his fellow-countrymen en- 
tertained for the geological works of Boblaye. 
Our fellow-member was employed in arranging the nu- 
merous observations which he had made in the department 
of Orne, when he received orders to repair to Africa, in order 
to triangulate the newly-acquired conquests in the province of 
Constantine. There, as in Greece, he engaged with ardour 
in the study of natural history, geography, and archeology. 
On his return to France, in the beginning of 1839, he an- 
nounced to the Society, at its first sitting in February, that a 
great portion of the province consisted of the chalk formation, 
containing Cadilli and Inocerami, of the same species as those 
of the chalk of Valogne ; and that this formation is covered by 
a thick deposit of calcareous marl, rich in fossils, which must 
belong to the lower portion of the tertiary formation. From 
this important fact, he concludes that the tertiary formations 
must s’echelonner, with relation to the basin of the Mediter- 
ranean, in the same manner in the south as in the north. 
A short time after this interesting communication, having 
returned to Pontivy, he presented to the Society numerous 
specimens of mAcliferous slates, from the Salles of Rohan, 
containing, at the same time, mdcles (chiastolites) of consi- 
derable size, spirifers, and trilobites, evident proofs of the 
metamorphism of these rocks. 
Having been appointed member of the Scientific Com- 
mission of Algeria, he again went to Africa in August 1839. 
In the month of November, in the same year, he accompanied 
the Duke of Orleans in the famous expedition of the Portes- 
de-Fer. This young prince, whose loss France still deplores, 
