5<M 



THE AMERICAN NATURALIST. [Vol. XXXVII. 



ing period the two gonomeres fuse a fusion of their nucleoli also 



With regard to the fate of the maternal and paternal halves during 

 maturation the author says that there are three possibilities ; Either 



symmetrical mixing of nuclear constituents, or (3) an unsymmetncal 

 mixing. He concludes that the first maturation is an equation divi- 

 sion and that the reduction occurs in the second maturation in such 

 a manner "that the ripe egg cell contains one half of the grand 

 paternal and one half of the grand maternal chromosomes " thus ful- 

 filling the second possibility named above. 



that of Montgomery and of Sutton, has shown that this fusion 

 occurs at a period long preceding the first maturation. 



BOTANY. 



Notes. — The Botanical Gazette for January contains the following 

 articles:— J. D. Smith, " Undescribed Plants from Guatemala and 

 Other Central American Republics, XXIV "; Arthur, "Cultures of 

 Uredineae in 1902"; Dean, "Experimental Studies on Inulase " ; 

 Livingston, "The Distribution of the Upland Plant Societies of 

 Kent County, Michigan"; and Schneider, "Contributions to the 

 Biology of Rhizobia." 



The Bulletin of the To my Botanical Club for January contains the 

 following articles : — Arthur, " Problems in the Study of Plant Rusts " ; 

 Evans, "Hepatic* of Puerto Rico — II. Drepano-lcjcunca" '; 

 Underwood, "An Index to the Described Species of Botrychium " ; 

 and Kellerman, "The Effects of Various Chemical Agents upon the 

 Starch-converting Power of Taka Diastase. 



its first number being also noted as "Old Series No. 139," it being a 

 continuation of Mccharis Monthly. 



