958 MINNESOTA BOTANICAL STUDIES. 



II. Classification of shores with reference to temperature. 



A. Warmer shores. 



1. Shores facing S. E., S. or S. W. 



2. Shores of which the slope approaches a plane perpendicular to the 

 incident radiations from the sun. 



3. Shores not subjected to shadows from neighboring objects. 



4. Shores upon which heat is reflected from adjacent objects. 



5. Shores composed of dark colored materials which absorb and retain 

 the heat rays of the sun. 



6. Shores of a texture unfavorable to rapid evaporation of moisture. 



7. Shores sheltered from abundant air-currents which would promote 

 evaporation of moisture. 



8. Shores of which the contour or situation produces unfavorable op- 

 portunity for the cooling action of rain, dew, surf, spray or running water. 



9. Shores bordering sheltered and limited areas of water in passing 

 over which the air currents are not appreciably cooled. 



B. Colder shores. 



1. Shores facing N. E., N. or N. W. 



2. Shores of which the slope varies from a plane perpendicular to the 

 incident radiations of the sun. 



3. Shores subjected to shadows from neighboring objects. 



4. Shores upon which heat is not reflected by adjacent objects. 



5. Shores composed of light colored materials which reflect and radiate 

 rapidly the heat rays of the sun. 



6. Shores of a texture favorable to rapid evaporation of moisture. 



7. Shores exposed to abundant air-currents, promoting evaporation of 

 moisture. 



8. Shores of which the contour or situation produces favorable oppor- 

 tunity for the cooling action of rain, dew, surf, spray or running water. 



9. . Shores not bordering sheltered and limited areas of water, but fac- 

 ing broad expanses over which air currents, in passing, become cooled. 



III. Classification of shores with reference to moisture. 



A. Moister shores. 



1. Shores crossed by gullies or streams, debouching upon them and 

 conveying moisture or retaining it in pools. 



2. Shores favorably exposed to rains, dews or drifting snows. 



3. Shores situated where surf or spray is thrown landward, either ow- 

 ing to the direct impingement of prevailing winds, or by reason of the 

 broad expanse of water off-shore. 



4. Shores upon which ice-floes are deposited in early spring, owing to 

 their outline, slope, or exposure to the prevailing winds. 



5. Shores from which the evaporation of moisture is retarded by shad- 

 ing, or by seclusion from atmospheric currents. 



6. Shores, the texture of which favors the retention of rain, dew, surf, 

 spray, snow, ice or running water. 



