REVIKWS 305 



discovery of the importance of measured light in flowering, seeding, 

 etc. Waller concludes that ib a broad way the water supply is most 

 directly controlling, since plant formations do not parallel closely the 

 temperature and light zones of the earth. 



In the discussion of soil factors another statement is made to which 

 we take exception. This is the suggestion that the sandy barrens of 

 the Southeastern United States do not support plant growth because 

 of low available moisture and lack of mineral salts. The success of 

 planting experiments, both in Florida and Michigan, indicates the falacy 

 of this idea, especially as the poor sands of Michigan are found to sup- 

 port white pine quite well, while formerly given over to jack pine and 

 Norway pine. We have reason to believe that the limiting factor on 

 these barrens is excessive temperature of the surface soil, due, primar- 

 ily in both cases, to their quick drying at the surface. 



In the discussion of biotic factors we are surprised by the lack of 

 any definite reference to the so-called "damping-ofif" fungi, which we 

 believe to play an important part in establishment, at least with forest 

 tree seedlings. We also encounter the statement that the white pine 

 blister-rust attacks the western yellow pine. This is at least misleading, 

 since our latest information states that this fungus has not appeared 

 west of the Mississippi. C. G. Bates. 



The Teaching of Fire Prevention. State of New Jersey Depart- 

 ment of Public Instruction, Trenton, September, 1930. 



Fighting Forest Fires. State of New Jersey Department of Con- 

 servation and Development, Trenton. 



Fires for Fun. State of New Jersey Department of Conservation 

 and Development, Trenton. 



The above three publications from New Jersey rank high among 

 the publications of this sort being issued in increasing numbers by 

 the various States for forest fire prevention propaganda purposes. 



The first of these, "The Teaching of Fire Prevention," is particu- 

 larly noteworthy at the present time from the fact that there is a 

 movement on foot to have all the States, whose legislatures meet 

 this year, adopt the policy of the State of New Jersey in requiring 

 the teaching of fire prevention in all public, private, or parochial 

 schools. It is this pamphlet which is being used by the State of New 

 Jersey to carry out the provisions of this educational compulsory law. 



