20 Biographical Memoir of 
d’elles dans toutes ses metamorphoses. C’est de lui, et de 
lui seulement, que datera la geologie positive, en ce qui con- 
cerne la nature minerale des couches ; mais ni l’un ni l’autre 
n’a donné & la determination des especes organisées fossiles, 
dans chaque genre de couche, la rigueur devenue necessaire, 
depuis que Jes animaux connus s’elevent 4 un nombre si pro- 
digieux.”” Tome i., p. 34. 
Mr Jameson returned to his native land in 1804, being re- 
called in consequence of the state of his father’s health. The 
knowledge of rocks and minerals he had acquired under 
the tuition of Werner proved of the utmost importance to 
him, and such knowledge no one possessed in this country 
but himself, which he subsequently greatly improved and 
extended. It appears to have been his full intention to have 
returned to Freyberg again, because in writing to his friend 
Meuder, he says: “ My dear Friend, I received your most 
agreeable and kind letter on the Ist day of February. It would 
have reached me sooner, but the intense frost prevented the 
packets from getting to England until late in the month of 
January. I return you a thousand thanks for the informa- 
tion you have had the goodness to communicate to me. I 
am much gratified by Werner’s kindness. There is nothing 
I desire so much as again to visit Freyberg ; and I seriously 
intend, on the very first opportunity, to visit Germany. At 
present, [ am so situated that I cannot undertake any jour- 
ney for at least twelve months ; after that period I hope to 
be able to pay a visit to Freyberg.” The indisposition of Dr 
Walker caused Jameson to lay aside all notions of paying a 
second visit to Germany. On the death of Dr Walker, in 
1804, Jameson was appointed Professor of Natural History ; 
and by his publications and admirable lectures, he soon 
raised the Edinburgh School to a high degree of celebrity. 
Dr Walker was profound and learned in classical literature. 
While engaged in preparatory labours, about the year 1750, 
his attention was attracted by the museum of Sir Andrew 
Balfour, the sight of which first inspired him with an attach- 
ment to natural history that operated powerfully on his mind 
and future pursuits, and which he never lost. After his 
death, a volume of Tracts was published, which, together 
with his “ Travels,” and his Essays in the Royal Transac- 
