76 
THIRTEENTH REPORT. 
Annual report for 1909. 
Publication 1. Biological Series 1. 95 pages. 17 plates. 
Containing : 
The Crawfishes of Michigan by A. S. Pearse. 
The Insect Galls of Michigan by Mel T. Cook. 
The Birds of School Girl's Glen by A. D. Tinker. 
Preliminary List of the Sites of Aboriginal Remains in Michigan 
by Harlan I. Smith. 
Publication 2, Geological Series 1. 218 pages. 33 plates. 9 figures. 
The Monroe Formation of Southern Michigan and Adjoining 
Regions by A. W. Grabau and W. H. Sherzer. 
Annual report for 1910. 
Publication 3, Geological Series 2. 160 pages. 17 plates. 18 figures. 
The Geology of the Iron River Iron Bearing District of Michi- 
gan by IL C. Allen. 
Ready for Publication. 
The Geology of the Copper Bearing Rocks of Michigan by A. C. Lane. 
2 voluipes. 
The Geology of Arenac County by W. M. Gregory. 
A Soil Map of the Upper Peninsula of Michigan. Scale G miles to the 
inch. 
Earthquakes in Michigan by Prof. W. H. Hobbs. 
In Preparation. 
The Geology of Wayne County by W. H. Sherzer. 
The Salt Industry of Michigan by C. W. Cook. 
The General Geography of Michigan by L. H. Wood. 
PROGRESS OF THE TOPOGRAPHIC SURVEY IN MICHIGAN. 
The ultimate aim of the topographic survey in Michigan is the map- 
ping of the entire area of the state, 57.980 square miles, in units of 
15' of latitude by 15' of longitude, each unit being issued as a separate 
sheet on a scale of 1:62,500, except in certain areas where for special 
reasons a larger scale is more desirable. 
When the survey is completed we shall possess a topographic atlas of 
the state which will consist of the unit quadrangles showing besides 
topography, all highways, railroads, trolley lines, the drainage, natural 
and artificial, and all permanent cultural features, including location 
of buildings at the time survey is made, bound together, with a key map 
on which the relative position of each separate sheet is indicated. It is 
not necessary to urge before this Academy the value of such an atlas 
of the state nor the urgent desirability of its completion at the earliest 
possible moment. 
Up to the present time a total of 4,924 square miles, or about 8% 
of the area of the state has been surveyed including sixteen 15-minute 
sheets in the Lower Peninsula, and in the Upper Peninsula seven 15' 
minute sheets, and four special sheets to accompany geologic maps of 
the iron districts, and the Calumet Special sheet. Of the work done in 
the Upper Peninsula all has been done at the expense of the U. S. Geo- 
