Authors' Catalogue. 191 
director, and the work of the survey will proceed, after the 
manner which has been found successful, of authorization of 
plans of operations after full consideration and conference 
upon estimates submitted by geologists in charge of parties. 
Under the organization now adopted, each geologist is at 
liberty to make full use of the facts which he observes within 
his field of operations, the degree of supervision exerted by 
the geologist in charge of any particular subject to be duly 
credited in an appropriate manner. For the geologists in 
charge the plan affords an opportunity to study a special sub- 
ject in all its aspects throughout the field of operations of the 
survey, either directly by personal observation or by confer- 
ence with associates. This opportunity is unequaled in both 
multiplicity and magnitude of the phenomena presented to 
each specialist. 
MONTHLY AUTHORS' CATALOGUE 
OF American Geological Literature, 
Arranged Alphabetically.* 
Adams, F. D. 
On the probable occurrence of a large area of nepheline-bearing 
rocks on the northeast coast of Lake Superior. (Jour. Geol., vol. 8, pp. 
322-325, May-June, igoo.) 
Ami, H. M.. 
Progress _of Geological work in Canada during 1899. (Can. Rec. 
Sci. vol. 8, pp. 232, July, 1900.) 
Ami, H. M. 
On the occurrence of Whittlesea in Nova Scotia. (Ottawa Natural- 
ist, vol. 14, p. 99, Aug. 1900.) 
Ami, H. M. 
On the sub-divisions of the Carboniferous system in eastern Canada. 
(Trans. Nov. Sco. Inst. Sci., vol. 10, pp. 162-178, 1900.) 
Barbour, E. H. 
Glacial grooves and striae in southeastern Nebraska. (Jour. Geol., 
vol. 8, pp. 309-312, May-June, 1900.) 
Barrett, R. L. 
The Sundal drainage system in Central Norway. (Bull. Am. Geol. 
Soc, vol. 32, pp. 1-21, 1900.) 
*Tliis list includes titles of articles received up to the 2(ltli of the precedinjj 
montli, including general geology, physiograpli.v, paleontology, petrology, and 
mineralogy. 
