28 : CHAPARRAL. 
TABLE 4.—Percentages of shade on selected plots of chaparral—Continued. 
PASADENA WATERSHED, CALIFORNIA, 1903—Continued. 














No. of survey. 
Slope 
| | 
North. South. East. West. 
No. of survey. | 
| | | 
= ~ | 2,000 to | 3,000 to | 2,000 to  3,000+to | 2,000 to 3,000 to| 2,000 to | 3,000 to 
3,000 | 5,000 | 3,000 | 5,000 | 3,000 | 5.000 | 3,900 | 5,000 
feet. feet. feet. | feet. | feet. | feet. | feet. | feet. 
142 2 ot 2 ese Se ee Nag ea | ete P| J05| an 20) | eee lise eae 90 45 
i erent een Re en Sees eee nace os eece £0 | SOME Sees nese 15S eee 
16.0. Re TOES 2 Se ee eet eee (emetic Tonle erty 80-|. ee 
| ee ee trae Ser yee Sa SEE ee | Ae Lone eee 30 |.--..--- [Seer | eee | Boe 
if, ae eget or DN tee ipa es Sebi] Rl ee PE ST aloe ee see | AcSe ele eee 
i eee ey Pee re | SoS ee [excise scree Per 250s aoe Seal eee es | ee Be ee [ee eae 
20-5 a ee a a | cee | a rae ee | lent seee. 
DT cre. ong SUS 5 SAE See ee ee | eral ae ta eae meee | ee eer ale ae SS [ae 
IN ORAS COTS cocdckascéonece 84 €6 o7 | 70 | 63 | 75 | 61 | 68 
| 
SANTA ANA WATERSHED, CALIFORNIA, 1903. 
Slope. 
North. South. | East. West. 

2,000 to 3,000 to | 2,000 to | 3,000 to | 2,000 to 3,000 to} 2,000 to 3,000 to 
3,000 5,000 3,000 5,000 3,000 5,000 3,000 5,000 
feet. feet. feet. feet. feet. | feet. feet. feet. 











These tables show that on these watersheds the density of cha- 
parral was greater in the zone between the 3,000 and 5,000 foot levels 
than in the zone between the 2,000 and 3,000 foot levels, on east, 
south, and west exposures. The density of the cover on north 
exposures was greater in the lower than in the higher zone. This 
is perhaps due to a difference in topography between the two zones. 
In the lower zone the slopes are extremely abrupt, while in the upper 
they are more uniform. 
The difference in the density of the different slopes holds true for 
both the Pasadena and the Santa Ana watersheds, and is due chiefly 
