42 Nature protected 
Similarly the nesting-places of 
remarkable birds and other animals 
should be charted. Figure 3 shows 
the distribution of the nests of four 
species of birds in Switzerland\ These 
various maps may be revised from 
time to time, if such a course is found 
to be desirable. The maps would be 
of great value for comparison, in 
showing to what extent the vegetable 
and animal worlds have changed after 
a lapse of twenty, fifty, or more years, 
in indicating what circumstances have 
caused the changes, and in assisting 
us in the care of what remains. 
All these inventories, statistics, and 
Nachweis der beachtenswerten und zu schiitzenden 
urwiichsigen Straucher, Baume und Bestande im 
Konigreich Preussen. I. Provinz Westpreussen. 
Mit 22 Abbildungen. Berlin, 1900, S. 5. 
1 Studer, Th., und Fatio, V. Katalog der 
Schweizerischen Vogel bearbeitet im Auftrag des 
eidgen. Departements fiir Industrie und Land- 
wirthschaft. I. Lieferung : Tagraubvogel. Bern, 
1889, Karte vn. 
