872 



SCIENCE 



[N. S, Vol. XLII. No. 1094 



G. A. Miller: "Independent generators of a 

 group of finite order. ' ' 



C. N. Haskins : " On the zeros of the function, 

 P(X), complementary to the incomplete gamma 

 function. ' ' 



Edward Kircher: "Group properties of the 

 residue classes of certain Kronecker modular sys- 

 tems and some related generalizations in number 

 theory. ' ' 



C. DE LA Vall£e Poussin: "Sur riutggrale de 

 Lebesgue. ' ' 



G. E. Wahlin : "A new development of the 

 theory of algebraic numbers." 



A. F. Carpenter: "Ruled surfaces whose flec- 

 node curves have plane branches. ' ' 



The opening (October) number of volume 

 22 of the Bulletin of the American Mathema- 

 tical Society contains : Report of the twenty- 

 second summer meeting of tbe society, by 

 Thomas Buck ; " Groupless triad systems on 

 fifteen elements," by Louise D. Cummings and 

 H. S. White; "Note on Green's theorem," by 

 C. A. Epperson; "Convergence of the series 



0. Archibald; "Shorter Notice": Loria's Per 

 la Biografia di Giovanni Ceva, by D. E. Smith; 

 "Notes"; and "New Publications." 



2 2 , 



1=0 j=0 ' 



x'y' 



-jy 



(y irrational)," by W. D. MacMiHan; "A cer- 

 tain class of functions connected with Fuch- 

 sian groups," by Arnold Emch ; " Professor 

 Bocher's views concerning the geometry of 

 inversion," by Eduard Study ; " The Davis cal- 

 culus," by E. "W. Davis; "Notes"; and "New 

 Publications." 



The November number (Vol. 22, No. 2) of 

 the Bulletin contains: "On the relation be- 

 tween linear algebras and continuous groups," 

 by L. E. Dickson ; " An aspect of the linear 

 congruence with applications to the theory of 

 Eermat's quotient," by H. S. Vandiver; 

 " Limits of the degree of transitivity of sub- 

 stitution groups," by G. A. Miller ; " The per- 

 mutations of the natural numbers can not be 

 well ordered," by A. B. Frizell; "Relations 

 among parameters along the rational cubic 

 curve," by J. E. Rowe; Review of Vallee 

 Poussin's Cours d' Analyse Infinitesimale, third 

 edition, by M. B. Porter; Review of Zeuthen's 

 Lehrbuch der abzahlenden Methoden der 

 Geometric, by E. S. Allen ; Review of Carslaw's 

 Teaching of Mathematics in Australia, by R. 



SPECIAL ABTICLES 



THE MOUNTING OF CELLOIDIN SECTIONS IN SERIES 



Investigators in both normal and patholog- 

 ical plant histology have to often resort to 

 celloidin for embedding parts of plants which 

 contain a considerable amount of lignified 

 tissue, as the sections are very apt to break up 

 badly in cutting if the material is embedded in 

 paraffin. 



The process of cutting and mounting cel- 

 loidin sections is very simple if only occasional 

 sections are required for study, as they can be 

 stained and mounted separately. It is some- 

 times desirable, however, to examine a whole 

 series of sections, in which case it is necessary 

 to stick the sections to a slide before staining 

 them, which greatly increases the difficulty. 

 Plowman^ has described a method of this kind 

 which very briefly is as follows : As the sections 

 are cut they should be transferred to a piece of 

 smooth thin paper, and when they are dry the 

 paper should be turned face downward on a 

 slide which has previously been coated with 

 albumen fixative. Add several layers of paper, 

 press down, and roll with a roller. Place an- 

 other slide on top of the sections, clamp down, 

 and dry for a few hours. 



I have had occasion to use the above de- 

 scribed method on various occasions with 

 rather poor success. The paper is very apt to 

 stick to the edges of the sections and either 

 tear them badly or pull some of them away 

 from the slide when the paper is finally removed. 

 The use of oiled paper will not entirely obviate 

 this difficulty unless the paper is very oily, in 

 which case it is apt to prevent some of the 

 sections from sticking to the slide if some of 

 the oil gets beneath them. I have found, fur- 

 thermore, that it is necessary to use a much 

 thicker solution of albumen than for paraffin 

 sections, which is apt to become deeply colored 

 in the subsequent staining, resulting in messy 

 looking slides. 



1 Bot. Gas., 37, pp. 456-461. 



