284 ' The American Geologist. April. i8!i:! 
places, with indication of their buildings, toijether with all isolated 
dwellinp:s and public buildings outside of town limits. 
2. That in each towiisliip at least one permanent bench nuirk be 
made, with record of the precise altitude above mean sea-level. 
3. iThat all contours be on a scheme involving intervals of five feet, 
or multiples of five feet, according to the slope of the ground, and that 
the contour interval be uniformly five feet wherever the slope of the 
ground is less than fifteen feet lo a mile, in wiiich case the contours 
shall be traced out by actual leveling. 
4. That all navigable streams and imiiortant water courses be located 
by continuous survey of their banks. 
5. That salt marsh land, and fresh water swani|) land, and overllow 
land be distinguished by distui(;t conventions, and that the boundaries 
to be indicated be those of the natural limits, not the legal segrega- 
tion limits. 
6. That there be at least three triangulation ])()ints to each plane- 
table sheet. 
7. That the field scale be not less than oik; and one-third inches to a 
mile, or three-quarters of a mile to an inch. 
8. 'iMiat the publication scale be one inch to one mile 
9. That the size of the atlas sheet be that of a quarter-degree square, 
limited by the even fifteen minute lines of latitude and longitude. 
10. That the U. S. Coast and (Jeodetic Survey be requested to contrib- 
ute as many triapgulation points as possible. 
' 11. That the headquarters for the survey be in California. 
l:.*. That the work be done by the U. S. Geological Survey. und(M- 
supervision of a commission of five persons representing the State of 
California, of whom four shall be ai)pointed by the governor, one lo be 
a representative of the agri(!ultnral interests of the State, one a repre- 
sentative of the mining iiiterests, one on nomitiation of the State Uni- 
versity, and one on nomination of the Leland Stanford Jr. University; 
and of whom the lifth commissioner shall be chosen by the others so ap- 
pointed. 
13. That the expense of the survey be divided eipially between the 
State and Federal authorities. 
14. That the U. S. (rcological Survey engrave the copper-plates for 
all the map sheets, wholly at its own expense, and thatitown the plates, 
and that the State of California have the right of taking electrotype 
transfers from each and all of such plates, for its own use. 
The preparation of sticli a map wmild necessarii}- be a work of 
years. Each utlas .sheet averauiiiii- in cost about $!5,0('O. i-orro- 
spondiiio- in area to alxuit .six and one haif towiisliips. would how- 
ever, ill itself be a complete map, iiide[)endeiitly surveyed, en- 
<ifa\cd and i)iiblished. Interruption or termination of the woik 
at any stage, therefore, would not affect the value of what had 
already been {leeomplished. 
