574 Obituary—Professor Theodor Kjerulf. 
definite. In the November Number of the Grotoctcan Magazine 
one cannot help being struck by the slip-shod system of reference 
used by two of the writers; e.g. “‘Tsch. Min. Mitt.” is absolutely 
meaningless except to those who know the book; ‘Bull. Imp. 
Mosc.”’ may refer to any Moscow society as no definite one is quoted. 
Another source of inconvenience is seen in the reference to 
authors :—Prof. Judd, Prof. Bonney, Mr. Teall, etc., for example, 
how much more definite would it be to refer to these and any writer 
by initials as J. W. Judd, T. G. Bonney, J. J. H. Teall? We find 
much fault with our French and German colleagues for the vexatious 
system of printing surnames only, thus causing endless misquotation 
and confusion in library cataloguing, and yet ourselves permit it in 
our own scientific publications. The perfection of quotation, on 
the other hand, is seen on pp. 496-501 of the same number of the 
GroLtogicaAL Macazing, and proves unmistakeably that the writer 
is familiar with the books he refers to. C. Davies SHERBORN. 
CONE-IN-CONE STRUCTURE IN A COAL-SEAM. 
Str, —What is commonly known as “cone-in-cone coal” or 
“crystallized coal” has, I presume, nothing to do with true cone-in- 
cone structure here referred to. Through a friend of the writer’s, a 
small concretionary mass of iron pyrites taken from the “ Roaster” 
coal-seam near Ashby-de-la-Zouch, Leicestershire, has come into his 
hands for examination. Externally the specimen has very much the 
aspect of a roughly rounded pebble, and is nearly black in colour, 
measuring 14 inch in diameter, and about ? inch thick vertically. 
Having had the stone cut horizontally through the middle, cone-in- 
cone structure showed itself in places around the outside; in fact, 
the specimen appears to be nearly wholly made up of the same 
structure, though only at all well developed near the surface. 
Whether the theory put forward by Mr. John Young, F.G.S., of 
Glasgow, and published in this Macazrnr, can or cannot account 
for the cone structure here seen, I leave others to judge; merely 
remarking that in my opinion some other explanation of the phe- 
nomenon must be found.! W.S. Grestey, F.G.S. 
OBLTUARY 
PROFESSOR THEODOR KJERULF. 
Born Marcu 30TH, 1825; Diep OcroBer 26TH, 1888. 
We regret to record the death, in Christiania, his native city, of 
Prof. Theodor Kjerulf, after a lingering illness. He was brought 
up and educated in Christiania, and after the completion of his 
University studies, spent some time in Iceland; he then went to 
Germany, where he studied in the laboratory of Bunsen, and at the 
same time pursued some geological investigations in the Harz and 
Tyrol. Returning to his native city, he commenced the study of the 
1 See W. S. Gresley, Note on ‘‘Cone-in-Cone” Structure, Grou. Mac. 1887, 
p- 17. John Young on ‘ Cone-in-Cone’’ Structure, Gron. Maa. 1885, p. 283. 
Prof. J. S. Newberry on ‘‘ Cone-in-Cone” Structure, Grou. Mage. 1885, p. 559. 
John Young’s reply to Prof. Newberry, Gzou. Mac. 1886, p. 139. 
