92 UNIVERSITY OF CALIFORNIA EXPERIMENT STATION. 



35. The maximum has in nine years but once reached 100, but every 

 year has gone to 90 or above for a few days. The maximum of 1898 

 was 98, and the next highest temperatures of that year were 93 and 

 89; in 1899 the two highest temperatures were 99 and 89; in 1900 

 they were 95 and 92, and in 1901 they were 92 and 87. 



THE EUCALYPTUS GROVES. 



The plantations of eucalyptus trees at this substation have deservedly 

 attracted much attention for some years past. They have been visited 

 by many persons and reported upon in many forms. Mr. Abbot Kin- 

 ney's work on Eucalypts contains photographs of single trees here, 

 together with notes upon their growth, etc. Professor McClatchie has 

 also taken many notes and photographs here. Former station reports 

 contain much historical and descriptive material on these eucalypts. 

 (See Report of 1892-4, pp. 428-432; Report of 1894-5, pp. 450-455; 

 Report of 1895-7, pp. 412-426; and Report of 1897-8, pp. 340-351.) 



A few of the large trees in the main group have died or have been 

 blown down. These losses seem to have been due in every case to poor 

 root systems, pot-bound or too large trees having been originally used. 

 The younger plantations show no such defects. Others of the older trees 

 will soon have to be removed, but specimens of all the species repre- 

 sented in this grove are now established elsewhere. 



The following table shows some of the measurements taken in this, 

 the oldest grove of eucalypts in June, 1902: 



Height. Girth. 



E. amygdalina 23ft. 21 in. 



E. calophylla 38" 47 



E. citriodora 61" 35 



E.corymbosa 36 " 32 



E. corynocalyx 61" 47" 



E. diversicolor .... 68" 42 



E. viminalis 53 " 44 



E.callosa _ 32" 15 



E. sideroxylon 53" 52 



Eucalypts on the Upper Mesa. The original planting of eucalypts, done 

 on the upper mesa nearly one hundred feet above the middle flat, was 

 in the form of a narrow strip, chiefly on the western side, with a few 

 rows across the south and north. This mesa is a long and very narrow 

 tongue of land nearly level on the top, sloping south toward the ocean. 

 On the east it descends almost perpendicularly to the canon bottom; on 

 the west the descent, less abrupt, is to the cottage mesa, or middle bench 

 of the substation. The light, gravelly soil, and the height and exposure 

 of this plateau, make the growth of trees difficult. Success here argues 

 similar success on plateaus even farther inland. 



The eucalypts planted here in 1889, thinned out in 1893 and 1894, and 

 since then uncultivated, have made in many cases noble trees, with 

 trunks that girth from 25 to 40 inches. Their growth has been lessened 

 in recent years by light rainfall, as most of them stand within sixty 

 feet of the edge of the mesa. In point of drought-resistance E. coryno- 

 calyx, E. rostrata, E. paniculata, and E. globulus are among the best. 



The younger grove on the upper mesa was begun in the spring of 1897, 

 when about eight hundred trees were set out, representing thirty-one 

 species. Other trees have been added since. The soil is light and poor, 



