70 JOURNAL OF FORESTRY 



floods, without reference to the cause of floods ... or the great 

 variation in flood-producing characteristics of different watersheds. 

 No general deductions of universal applicability can be made. Every 

 stream is a f^roblciii in itself. . . . Observations indicate that forests 

 may both increase and decrease floods." 



The author apparently believes that the eft'ect of forests is more 

 detrimental than beneficial in times of flood for the four references to 

 the subject are to the eft'ect that forests retarded the melting of snow 

 until the late spring rains began. Their eft'ect on low-water flow is 

 also minimized in one short sentence "the inability of the same heavy 

 forests to produce a good low-water flow in dry seasons is shown by 

 the fact that the discharge . . . fell .05 cubic foot per second per 

 square mile." 



In considering the eft'ect of forests on surface runoft', the author 

 says : "Mrgin forest with deep humus cover, though of rare occurrence, 

 ha'^ considerable absorptive capacity." 



Considerable use is made of the data in the old Forestry bulletin on 

 forest influences in discussing the eft'ect of forests on tem]>erature, 

 evaporation, and precipitation, but no use is made of the later works 

 of the Forest Service on forest influences such as that of Pearson, 

 jaenecke. Griffln, or Zon, or the compilation of the Forestry Committee 

 of the Fifth National Conservation Congress. 



The fi'Turcs, charts, and maps with which the work is illustrated aid 

 greatly in understanding the text and the formula?. There are quite 

 a number of tables in the book, especially relating to precipitation which 

 quite properly belong in an appendix as they amount to more than 

 40 pages and are used only as a reference. The addition of a bibli- 

 ography would add considerably to the work, though references are 

 scattered through the text in the form of footnotes. E. N. M. 



Mikrographie des HoLzes der oiif Java vorkoininenden Baiimarten 

 III. By Dr. H. H. Janssonius, unter Leitung von Dr. J. W. Moll. 

 Leiden. E. J. Brill. 1018. Pp. TfU. 



This volume deals' with the Javanese woods belor.ging to the Caly- 

 ciflorse. Included under this classification are the Connarace??, the 

 Leguminosce, the Rosacere, the Saxifrage?e, the Hamamelidere, the 

 Rhizophorese. the Combretace?e, the Myrtacese, the Melastomacc-e. the 

 Lythrariese, the Samydace?e, the Datisceae, the Araliacese, and the 

 Cornacese. 



