280 The American Geologist. April, 1893 
(1.) In the first place ''Fossils of the Tertiary Formation" [s] is the 
wording found on the title page of the •' Medial Tertiai~y,'' so that the two 
titles given by Dr. Dall refer to the same work. Conrad's publication 
issued in parts from 1833 to 1835 and including mostly Eocene species 
is entitled, Fossil Shells of the Tertiary Formations of North America. 
(2.) The color of the covers is not the same for all parts of the first 
edition of ''Fossil Shells" &c. (p. 219, line 1.); for example the covers of 
Nos. 1 and 4 are of a light brownish yellow color and not bright yellow 
like those of No. 2. The kind of paper used, too, is entirely different. 
Again the covers of the "reprint" of No. 3 (p. 224) are not grayish green, 
but deep blue. For this mistake my typewritten copy is at fault. Not 
having any deep blue paper at hand when this copy was bound, grayish 
green paper was substituted as a convenient reminder that the covers 
of this number were totally diflferent from any of the original No's. 
(3.) The form of the preface to No. 1, referred to by Dr. Dall as 
having "been reprinted" (224,) is in fact the original one, while that 
classified by him as the original (p. 219) is the revised form. This is 
evident from the fact that good presswork demands that all great head- 
ings like Preface, Introduction, &c. shall occur on right-hand pages. So 
the Preface referred to evidently does in one of deGregorio's copies, and it 
certainly does in E. A. Smith's copy as well as in both copies at the 
Wagner Institute and in the one atthePhiladelphia Academy of Natural 
Sciences. The preface in these copies begins on page v, and the dedi- 
cation to Morton is signed, "T. A. Conrad." In the form of the pre- 
face cited as the original (p. 219) it commences on page iv, i. e. the left 
hand page of the book and the dedication is signed "T. A. C.;" pp. v and 
Yi have been rewritten and enough extra matter inserted to necessitate 
intruding on page iv, otherwise the whole book must needs have been 
repaged. Again, in the original form of the preface {i. e. that beginning 
on p. V.) the following statement occurs: "The organic remains of the 
Ferruginous Sand formation have already been illustrated by Dr. Mor- 
ton, who is about to republish his essays, with much additional informa- 
tion and with splendid lithographic figures of shells and zoophytes." 
The republication referred to having appeared in 1834, it is evident that 
this preface could not have been written subsequent to 1835 (p. 224). 
(4.) In the "republication" of No.3,P1.15 is placed opposite page 37; PI. 
16, opposite page 41: PI. 17, opposite page 49; PI. 18, opposite page 55 
which contains the explanation of all four plates. Page 55 was therefore 
evidently not "misplaced by the printer" as has been supposed (p. 225). 
(5.) On page 223 occurs the following statement regarding the two 
forms of the introductory part to the "republication" of No. 3. "This 
edition, being less obnoxious to criticism by the friends of Lea, is the 
one most commonly found in copies of the work." Of the copies we 
have, or could have had access to, seven have ^this "obnoxious" edition 
(viz., Dall's, E. A. Smith's, Harvard library copy, Whitfield's, W. B. 
Clark's, T. H. Aldrich's, and one Wagner Institute copy,) while three 
only have the less "obnoxious" form (viz. Meek's, one Wagner Insti- 
tute copy and the Philadelphia Academy copy). 
