- 4 - 
 
 
    lHe should also have some mental picture of the other professions 
which are trying to influence that landscape, how they go about their 
work, and how they help or hinder his own work. 
 
     3. What He Can Do.    To acquire this knowledge, a student must 
have acquTre 7r=a an-Technical skills in field, laboratory, and 
office operations. 
 
     He should have made an inventory and map of the food, cover, and 
other environmental conditions on a sample area of land or water, and 
a plan for making that area more productive.   He should have execu- 
ted such a plan for a season, and drawn deductions from his experience. 
 
     He should have planned and executed an animal census and drawn 
deductions from it. 
 
     He should have trapped, marked, released, and retaken animals 
for purposes of tracing movements, measuring density, or analyzing 
composition of the population. 
 
     He should have found and observed nests or young, and recorded 
and analyzed mortality. 
 
     He should have planned and executed some kind of quadrat for 
recurrent measurement of changes in    vegetation. 
 
     He should have reared some animal in captivity.   Artificially 
propagated animals, while probably of diminishing importance as a 
means of replenishing wild stocks, are often indispensable as con- 
trols for experiments on wild animals.- 
 
     He should have developed some degree of expertness in "reading-

sign," that is, in determining, by inference from indirect evidence,

the kinds, numbers, habits, and status of animals on an area of land 
or water, and their relation to its plants and industries. 
 
     He should have become an expert in at least one field of natural 
history, and he should have developed some competence in the others. 
(By "fields" is meant birds, mammals, fish, reptiles, plants,.
etc.) 
 
     He should have collected and analyzed stomachs, pellets,tand 
scats. 
 
     He should have made usable bird and mammal study skins, extracted 
bones from a carcass, collected and prepared herbarium specimens of 
plants and plant foods. 
 
     He should be able to score 50 per cent of usable negatives in 
ordinary technical photography. 
 
     He should know how to use compass, plane table, planimeter, 
slide rule, and calculator. 
 
     He should be able to "post" a carcass and arrive at some notion

of its normality or pathology and its cause of death.l He should know 
where and how to see  interpretation of what he cannot himself 
interpret. 
 
     He should have compiled simple statistics, graphed them, and