EUCAL YPTUS. 13 







there are few in California over 150 feet high. If, however, 

 some were planted in any of the burned and desolated 

 redwood coast canyons of California where the conditions 

 of moisture and exposure are similar to those in its native 

 haunts we might reasonably expect to see blue gum trees 

 eventually as tall as any in Australia. In its native haunts 

 the blue gum is often, nay, generally, exposed to light 

 frosts. Some very observant planters in the warmer parts 

 of New South Wales state that the Eucalyptus globulus is 

 never a long lived and really successful tree unless subjec- 

 ted to occasional nipping airs. Other authorities, however 

 claim successful experiments in tropical highlands with this 

 species, locations probably free from frost. But such reports 

 are only made from tropical sections with a heavy rainfall. 

 The tree has failed in Arizona and Texas. But, in those 

 places, its failure is due, doubtless, to excessive frost on the 

 one hand, and prolonged excessive heat on the other. 



Mr. J. Ednie Brown and Mr. Walter Gill both found 

 the blue gum unsuited to their interior plains (South Aus- 

 tralia) generally similar in dryness and heat to our interior 

 valleys. We have fully confirmed their experience except 

 where the subsoil is moist. 



In Arizona even this condition fails, apparently, to 

 reconcile them to the prolonged heats of that section 



In Australia Eucalyptus leucoxylon, Eucalyptus corynoc- 

 alyx and Eucalyptus polyanthema seem specially suited to 

 sections too dry for the blue gum, and Eucalyptus rostrata 

 for air too dry and hot and frosts too severe. 



The blue gum is the fastest growing tree in the world. 

 There are, indeed, trees that for a short time, or under 

 special conditions, grow as fast as the blue gum. In fact, 

 in the damp Vitorian gorges the variety regnans of 



