196 M. Rozet on the Life and Writings of 
its appearance ; a work full of new facts, described with that 
clearness, and classified with that judgment, for which our 
colleague was distinguished. Geologists were then enabled 
to understand the relations which exist between the different 
stratified formations of Brittany and the large quantity of 
plutonic rocks which have traversed and modified them at 
so many points. 
Being connected with the topographical operations in the 
north of France in the year 1827, Boblaye engaged with great 
ardour in the study of the jurassic formation of that coun- 
try, when he was seized with brain fever, which brought him 
nearly to the grave. Happily, however, the strength of his 
constitution enabled him to overcome this attack, and as soon 
as he was able to walk, he resumed his favourite studies. 
His Memoir on the jurassic formation of the north of France,* 
appeared in 1829. He points out, in this treatise, the rela- 
tions of the different members of the series with those of 
England, to which the attention of all the Continental geolo- 
gists was then directed. 
In the course of this same year, he was subjected to a 
severe affliction. He received an order to set out for Greece, 
where a French army had just put a final stop to Ottoman en- 
croachments, at a moment when the hopeless condition of 
his younger brother, the individual who shared in his attach- 
ment to geology, required him not to leave his bedside. He 
complied with the order as soon as another Boblaye arrived 
to take his place beside the dying youth; and scarcely had 
he set foot in the vessel which was to convey him to Greece, 
when his brother’s death took place. 
The campaign in the Peloponnesus, to a mind so intelli- 
gent and active as that of our fellow member, was the occa- 
sion of a multitude of researches and important discoveries. 
No intellect could remain inactive in such a country ; Ais em- 
braced every thing, geodesy, topography, geology, archzolo- 
gy, &. &e. Conjointly with his companion Pétier, he began 
to make a great trigonometrical survey, in order to lay the 
foundations of a general map of the country. While so do- 
ing, he soon exposed himself to the influences which produce 
* Annales des Sciences Naturelles, Mai 1829. 
