94 Correspondence—Mr. S. 8S. Buckman. 
the reference will be complete. This method, followed by all who 
have dealt with the subject in an extensive and practical way, is 
found to be the only one that will work satisfactorily. 
C. Davins SHERBORN. 
UNIFORMITY IN SCIENTIFIC BIBLIOGRAPHY. 
Srr,—Concerning the manner of quoting works of reference, I 
also have to make complaint, namely, that authors sometimes quote, 
as if it were a complete work, a paper which may be part of some 
larger publication. 
Authors, however, are not always to blame in this matter, because 
it arises from the cause upon which I have another complaint, 
namely, that some of the Societies who issue Proceedings, ete., often 
fail to state on the “ Authors’ copies” anything at all concerning 
the fact that the papers are extracts from their publications. 
Some of our County Field Clubs are adepts at withholding infor- 
mation. Sometimes they append no date at all to their publications ; 
while their authors’ copies suffer, in addition to the omission men- 
tioned, from absence of date, absence of number of volume, and 
changed paging. I notice that even the Geological Society omits to 
give the volume number upon its “ authors’ copies.” 
I would suggest that the Council of the Geological Society first 
rectify this matter, and then issue a strongly-worded circular to 
every Secretary or Hditor of every scientific society in the kingdom 
drawing attention to these omissions, and stating what is required. 
Since it is the habit of some booksellers and private individuals to 
break up odd volumes of Proceedings into their different papers, I 
would suggest that it is also recommended that these data be printed 
at the heading of every paper in every volume of Proceedings ; at 
present such information is lost if one happens to buy the parts of 
volumes so treated. 
Date of papers.—I cannot agree with Mr. Davison (Geox. Mac. 
Dec. III. Vol. VI. No. I. p. 48) that the date of reading be taken as 
the date of a paper. A new species must date from the time when 
it is figured, and this cannot happen until the publication of the 
volume. If authors’ copies be printed in advance, they should be so 
dated, both themselves and in the volume. 8. S. Buckman. 
SroneHousE, Jan. 7, 1889. 
PROFESSOR BLAKE’S ‘‘MONIAN SYSTEM.” 
Srr,— Professor Blake’s reply to my ‘“ Notes” on his ‘“ Monian 
System ” requires a few brief comments. 
Prof. Blake now admits the presence of true schists as derived 
fragments in the Upper Archean of Anglesey ; but he attempts to 
neutralize their effect by alleging examples where such fragments 
occur in the upper part of the formation from which they are 
derived. He says, “The conglomerate of Bull Bay is made of the 
underlying quartz rock.” But he has to prove that the quartz rock 
was not of contemporaneous origin, if the cases are to be parallel. 
