4 i 6 BOTANICAL GAZETTE [may 



The second part of Janssonius' elaborate micrography of the woods of 

 Java 4 has recently come from the press. In the notice of the first part of this 

 work 5 w r e described the plan, w r hich is here merely extended. The part includes 

 in the concluding section of the first volume (Dicotyledones, Polypetalae, Thalami- 

 florae) descriptions of 67 species, in addition to the 108 of the first section. The 

 second volume begins the Disciflorae and presents 54 species. The complete 

 work will certainly be a monument of industry and will be serviceable for the 

 microscopic identification of Javanese woods. That the game is worth the 

 candle, we may be permitted to doubt. — C. R. B. 



Microscopy of technical products 



Now that so much attention is being paid to the purity of foods, drugs, and 

 manufactured products of all kinds, it becomes of the greatest importance to 

 have adequately trained men in municipal, state, and national offices, to whom 

 can be submitted the many questions that are sure to arise as to the adulteration 

 or sophistication of marketed articles. Unfortunately the number of competent 

 persons is far short of the demand, and this state of affairs is sure to continue 

 for some time. In this situation the only recourse is to have accurate handbooks 

 in which may be found detailed descriptions of the characteristics, chemical and 

 microscopic, of all the commoner substances which enter into commerce. 1 nen 

 one who has a reasonable familiarity with microscopic manipulation may be 

 able to determine the more obvious cases of adulteration, and by expenence 

 may acquire real expertness. 



To put into reach of American laboratories one of the most valuable of 



WlNTON 



Kate 



tory of the Department of Agriculture, with the assistance of Dr 

 has translated an edition of Hanausek's Lehrbuch der technischen Mikroskopie,^ 

 which represents the last German edition extensively revised by the author. 

 The translators have also included a considerable amount of new material, an 

 in particular they have incorporated into the key to economic woods— a mos 

 valuable feature of the book, permitting one to determine most of the species 

 from a fragment of the wood— the American species of commercial importance. 

 The illustrations have also been improved and augmented. 



4Janssonius, H. H., Mikrographie des Holzes der auf Java vorkommen en 

 Baumarten; im Auftrage des Kolonial-Ministeriums unter Leitung von Dr. ^^ 

 Moll bearbeitet im Anschluss an "Additamenta ad cognitionem florae ar ww 

 javanicae auctoribus S. H. Koorders et Th. Valleton." Zweite Lieferung. ^ 

 Vol. I, pp. 369-568. Vol. II, pp. 1-160. Jigs. 45-95. Leiden: E. J. Brill. io°»- 



sBot. Gazette 43:345. 1907. • d b the 



6 Hanausek, T. F., The microscopy of technical products. ReV1Se KA ^, G . 

 author and translated by Andrew L. Wintox, with the collaboration o _ 



Barber. Imp. 8vo. pp. xii + 471. figs. 276. New York: John Wiley & Sons. 

 $4-75- 



