REPRODUCTION OF WESTERN YELLOW PINE. 



119 



count them, they being then only in their second year. It is evi- 

 dent, however, that a considerable number of these small seedlings 

 must have survived, since the total number of all age classes is 

 slightly greater in 1920 than shown by the 1918 counts. No seed- 

 lings originated in 191S. since absolutely no seed was borne in 1917. 

 Seedlings from 1919 germination were fairly abundant but were 

 not counted. 



Table 27. — Damage to reproduction by sheep on a favorable site. 



[Pastures grazed bv cattle and horses only. Open range grazed also by sheep. Seedlings of 1914, 1916, 



and 1917 germination.] 



Location. 



Dimen- 

 sions. 



Number of 

 seedlings. 



Average height. 





1918 1920 



1918 



1920 





Feet. 

 8.5 bv 1 1 8 

 8.5 by 1 1 B 



8.5 by 1 1 8 



234 288 

 101 106 

 86 95 



Inches. 

 6.6 

 2.5 



3.4 



Inches. 

 10.4 





4.6 





7.2 







Taylor pasture: 



8^ by 60 

 iy 45 



161 176 

 22* 256 





13.9 



60 feet distant 





11.2 











389 432 



8.0 



12.6 





8.5 bv 60 

 8.5 by 40 





Open range (outside of Taylor pasture): 



30 15 

 12 14 





3.3 



60 feet distant 





5.3 











42 29 



2.6 



4.3 





10 bv .50 

 10 by -30 







17 



5 





7.9 







2.4 









The outstanding feature of Table 27 is the great superiority in 

 both number and size of the seedlings in the Taylor pasture. Since 

 this area was inclosed in the fall of 1913. the large seedling crop 

 which germinated in the summer of 1914 received full protection 

 against sheep. Damage to this crop of seedlings undoubtedly ac- 

 counts for the smaller number on the open range as well as in 

 the Corey pasture, which was grazed by sheep until the spring of 

 1916. Since no good seed crop occurred after 1913 (except that of 

 1918, which is not considered in these counts), the Corey pasture 

 has not been able to gain noticeably on the open range in point of 

 numbers. With respect to height, however, it showed a distinct 

 lead over the open range in both 1918 and 1920. The lower average 

 height in the Corey pasture than in the Taylor pasture is accounted 

 for partly by the stunted growth resulting from injuries prior 

 to 191G. and partly by the fact that many seedlings were killed prior 

 to 1916, thus reducing the number in the oldest age class. It is 

 interesting to note that in both pastures the average height growth 

 from 1918 to 1920 was -1 inches, whereas on the outside it was only 

 2 inches. 



