92 Correspondence—Dr. C. 8S. Du Riche Preller. 
CORRESPONDENCE. 
THE CARRARA MARBLE DISTRICT (APUAN ALPS). 
Srz,—In reply to Professor Bonney’s remarks on p. 47 of the 
Groroeicat Magazine of January, suffice it to point out (1) that the 
determination of the age of the crystalline schists and of the marble 
beds is essentially a question of paleontological and stratigraphical 
evidence, which, as I have shown, is absolutely conclusive, and is, more- 
over, universally accepted; (2) that it was neither the object nor 
within the available space of my paper to enter into the details of micro- 
scopical examination, the less so as this part of the subject has been 
exhaustively dealt with in the recent memoirs of Professor d’Achiardi, 
of Pisa, and of Mattirolo and Franchi of the Italian Geological 
Survey; (3) that the district of the Apuan Alpsis pre-eminently one 
which, owing to its extent and complexity, requires long and patient 
study of the entire area, and cannot be mastered by two admittedly 
incomplete visits, of only a few hours each, barely beyond one point 
of its periphery. C. Du Ricue Preiirr. 
EDINBURGH. 
January 12, 1916. 
THE CRYSTALLINE ROCKS OF THE PIEMONTESE ALPS. 
Srr,—In a footnote (p. 16) of my paper on the Permian formation 
of the Maritime and Western Alps in the Gxoxoeicat Macazrne of 
January, I mentioned that I propose to dealin a subsequent paper more 
fully with the crystalline schists and the pietre verdi areas, also in 
relation to the anti-Archzan and pro-Mesozoic views of Franchi as 
opposed to those of Zaccagna. In the meantime I should perhaps 
mention that in the most recent Italian geological maps just come to 
my notice the extensive crystalline cale-schist formation, which up to 
1909 figured as pre-Paleozoic, has been rejuvenated to Mesozoic. 
C. Du Ricuz PRELLER. 
EDINBURGH. 
January 12, 1916. 
Si TAL OPN IS5 Sa 5 
ARTHUR VAUGHAN, 
B.A. (Cant.), M.A. (Oxon.), D.Sc. (Lond.). 
BoRN MARCH, 1868. DIED DECEMBER 38, 1915. 
(WITH A PORTRAIT, PLATE V.) 
Tur death at the early age of 47 of Dr. Arthur Vaughan, which took 
place at Oxford on December 8, removes one of the most brilliant of 
British stratigraphical geologists. 
Dr. Vaughan was the son of the late William Vaughan, F.I.A., 
Actuary to the Board of Trade, and was born in London in 1868. 
After a highly successful career at University College School, he 
entered University College, London, in 1885, and there acquired his 
first interest in geology from the influence of Professor Bonney. In 
1887 he entered Trinity College, Cambridge, with an open scholarship, 
