906 
W. D. MacMillan: ‘‘An existence theorem for 
periodie solutions.’’ 
W. F. Osgood: ‘‘A condition that a function in 
a projective space be rational.’’ 
J. C. Fields: ‘‘A method of proving certain 
theorems relating to rational functions which are 
adjoint to an algebraic equation for a given value 
of the independent variable.’’ 
M. B. White: ‘‘The dependence of focal points 
upon curvature for problems of the calculus of 
variations in space.’’ 
J. E. Hodgson: ‘‘Orthocentrie properties of the | 
plane directed n-line.’’ 
S. E. Urner: ‘‘Certain singularities of point 
transformations in space of three dimensions. ’’ 
J. R. Conner: ‘‘ Multiple correspondences deter- 
mined by the rational plane quintic curve.’’ 
Tur March number (volume 18, number 6) 
of the Bulletin of the American Mathematical 
Society contains: Report of the winter meet- 
ing of the Chicago Section, by H. KE. Slaught; 
“ An identical transformation of the elliptic 
element in the Weierstrass form,” by F. H. 
Safford; “Surfaces in hyperspace which have 
a tangent line with three-point contact passing 
through each point,” by C. L. E. Moore; 
“Note on mixed linear integral equations,” 
by W. A. Hurwitz; “Note on the graphical 
solutions of the fundamental equations in the 
short methods of determining orbits,’ by A. 
©. Leuschner and B. A. Bernstein; “On a 
functional equation,” by A. R. Schweitzer; 
“Shop mathematics,” by C. F. Warner with 
rejoinder by CO. N. Haskins; “Shorter No- 
tices”: Dumont’s Arithmétique générale, by 
N. J. Lennes; Schur’s Grundlagen der Geom- 
etrie, by F. W. Owens; Appell and Dauthe- 
ville’s Introduction 4 Etude de la Physique 
et de la Mécanique appliquée, by J. B. Shaw; 
Crelier’s Systémes cinématiques, by Arnold 
Emch; “Notes”; “ New Publications.” 
Tue April number of the Bulletin contains: 
Report of the February meeting of the so- 
ciety, by F. N. Cole; “ On the foundations of 
the theory of linear integral equations,” by E. 
H. Moore; “ Shorter Notices”: Young’s Fun- 
damental Concepts of Algebra and Geometry, 
by E. B. Lytle; Friedel’s Lecons de Cristal- 
SCIENCE 
[N.S. Vou. XXXV. No. 910 
lographie, by J. B. Shaw; Andoyer’s Nouvelles 
Tables trigonométriques fondamentales, by EH. 
W. Brown; Annuaire du Bureau des Longi- 
tudes pour l’An 1912, by E. W. Brown; 
“ Notes ”; ‘‘ New Publications.” 
SPECIAL ARTICLES 
TERTIARY DEPOSITS OF EASTERN MEXICO 
Our investigations during the past year on 
the eastern coast of Mexico have brought out 
very important facts in connection with the 
historical geology of the Gulf Coast. 
As stated in this journal a year ago, de- 
posits which are lithologically and faunally 
the same as those referred to the Kocene in the 
Texas Coastal Plain were traced southward 
through northeastern Mexico to the Conchos 
or Presas river. Fossils characteristic of sub- 
stages of the Texas Claiborne were found on 
this river, and beyond it the sediments were 
traced southward to a point a few miles north 
of Abasola, where they passed from sight be- 
neath the overlap of the San Fernando Oligo- 
cene. The materials of the Eocene through- 
out this region are clays and sands in all re- 
spects similar to those of the Texas area and 
the fossils are species practically identical 
with those of that region. 
The materials of the Oligocene are yellow 
clays and sands with thin beds of impure 
limestone, carrying an abundant fauna. These 
beds are not represented at all in the Texas 
area between the Brazos and Rio Grande. If 
they were ever present they have been eroded 
or concealed by the overlap of later beds. 
From the point north of Abasola, where 
the San Fernando is found resting upon the 
Papagallos shales of the Cretaceous, this con- 
tact continues southward along the eastern 
border of the valley of the Soto la Marina 
river to the town of the same name; then it 
parallels the eastern flank of the Tamaulipas 
range, drawing gradually nearer the Gulf 
shore until, in the vicinity of Tordo bay, the 
Cretaceous is found within 8 miles of the 
coast. 
1 ScIENCE, Vol. XXXIII., No. 841, pp. 232-234. 
