702 



SCIENCE 



[N. S. Vol. XXIX. No. 7-±8 



the like, and is interspersed with numerous 

 useful hints and cautions. In the 48 pages of 

 chapter X., the author gives a concise state- 

 ment of the fixation, sectioning, staining and 

 mounting of tissues, together with brief dis- 

 cussions of microtomes and section knives, 

 drawings for book illustrations, and the prep- 

 aration of models. The practicability of the 

 method for making models of blotting paper 

 will appeal to all biological workers. 



The book is remarkably free from typo- 

 graphical errors. Only two or three insig- 

 nificant ones have been noted by the reviewer, 

 as : the omission of the prime marks of A'B', 

 Fig. 15, page 6 ; ecently for recently, page 260 ; 

 and speeimen for specimen, page 282. 



An extended review of the book would be 

 superfluous as its merits are already sufii- 

 ciently known to the readers of Science. Its 

 past success is adequate commentary on the 

 author's judgment as to what is needful in a 

 book devoted to the principles involved in 

 making microscopic observations. 



Michael F. Guyer 



SCIENTIFIC JOVSNALS AND ARTICLES 



The April number (volume 10, number 2) 

 of the Transactions of the American Mathe- 

 matical Society contains the following papers : 



L. E. Dickson : " General theory of modular in- 

 variants." 



I. Schur : " Beitrage zur Theorie der Gruppen 

 Imearer homogener Substitutionen." 



E. J. Wilczynski: "■ Projective differential geom- 

 etry of curved surfaces (fourth memoir)." 



Edward Kasner : " Natural families of trajec- 

 tories : conservative fields of force." 



G. W. Hartwell : " Plane fields of force whose 

 trajectories are invariant under a projective 

 group." 



W. A. Manning: "On the order of primitive 

 groups." 



G. D. Birkhoff: "Existence and oscillation the- 

 orem for a certain boundary value problem." 



Maxime Bocher : " On the regions of convergence 

 of power series which represent two-dimensional 

 harmonic functions." 



The April number (volume 15, number Y) 

 of the Bulletin of the American Mathematical 



Society contains; Report of the February 

 meeting of the society, by F. N. Cole ; " Be- 

 zout's Theory of Resultants and its Influence 

 on Geometry" (presidential address), by H. 

 S. White ; " On the Representation of Num- 

 bers by Modular Forms," by L. E. Dickson; 

 " Note on Liiroth's Type of Plane Quartic 

 Curves," by H. S. White and K. G. Miller; 

 " Cantor's History of Mathematics," by D. E. 

 Smith ; " Shorter Notices " : Slaught and 

 Lennes' High School Algebra, by E. B. Lytle; 

 Schoenflies' Einfiihrung in die Hauptgesetze 

 der zeiehnerischen Darstellungsmethoden, by 

 Virgil Snyder; Laurent's Geometrie An- 

 alytique Generale, by E. B. Cowley; Petit- 

 Bois' Tafeln unbestimmter Integrale, by E. 

 L. Dodd ; Annuaire du Bureau des Longitudes, 

 by E. W. Brown; "Notes"; "New Publica- 

 tions." 



The May number of the Bulletin contains: 

 Report of the February meeting of the San 

 Francisco Section, by W. A. Manning; "The 

 Construction of a Space Field of Extremals," 

 by E. G. Bill; "The Second Variation of a 

 Definite Integral," by A. L. Underbill; "A 

 Simpler Proof of Lie's Theorem for Ordinary 

 Differential Equations," by L. D. Ames; 

 "Heath's Euclid," by D. E. Smith; "Shorter 

 Notices " : Czuber's Differential- und Integral- 

 rechnung, by L. W. Dowling; Fabry's Traite 

 de Mathematiques Generales, by C. L. E. 

 Moore; Schubert's Auslese aus meiner Unter- 

 richts- und Vorlesungspraxis and Loria's Pas- 

 sato ed Presente delle Teorie Geometriche, by 

 Edward Kasner; Miiller's Fiihrer durch die 

 mathematische Literatur, by G. A. Miller; 

 Voss' Ueber das Wesen der Mathematik, by 

 Florian Cajori ; " Notes " ; " New Publica- 

 tions." 



BOTANICAL NOTES 



the botany of the FAEROES 



Eight years ago under the general direction 

 of Professor Dr. Eugene Warming the first 

 volume of a comprehensive work on the vege- 

 tation of the Faeroes Islands was published 

 simultaneously in Copenhagen (Det Nordiske 

 Forlag) and London (John Wheldon & Co.). 

 It contained 340 pages of text, ten plates and 



