172 BOTANICAL GAZETTE [February 



certain representatives of Ranales, and shows how the scattered bundles of a 

 petiole may be converted into a ring, and the bundles of one side of the ring 

 approximate the opposite side so as to produce a single arc— M. A. Chrysler. 



Solution of mitoses.— Experiments of Oes 2 ^ with various root tips, embryo 

 sacs, and pollen mother cells show that cells capable of growth and division con- 

 tain a chromatin -dissolving enzyme {nuclease), which dissolves chromatin when 

 toluol, chloroform, carbolic acid, etc., are added. Metaphases, anaphases, and 

 telophase are most quickly attacked, the prophases being less susceptible, and the 

 resting nucleus still more resistant. In autolyzed objects the spindle is dissolved, 

 but the nucleolus and nuclear membrane of resting nuclei remain unaffected. The 

 effect of temperature, neutral salts, free acids, and alkalies was observed in various 

 objects. The writer believes that the diminution of chromatin in the telophase, 

 observed by Strasburger and others, may be due to nuclease. If nuclease func- 



matin 



gular 



qualities.— Charles J. Chamberlain 



Tyloses in tracheids of Conifers.— Chrysler* has reinvestigated this subject. 

 and finds tyloses in the heart wood of the root, and in the first year's growth 

 of the axis of the strobilus. So far as his work goes, they are confined to Pinus, 

 the examination of the root wood of 12 other genera and of the cone axes of ', 

 other genera failing to reveal them. The effect of wounding was also studied, 

 but it did not result in extending the range of tyloses, either to other genera or 

 to other regions of Pinus; but wounding did result in inducing the occurrence 

 of tyloses in the normal regions of Pinus. It is suggested that these facts may 



J 



reason 



Plant diseases.— Stewart and Hodgkiss in a recent bulletin* 1 discuss the 

 carnation bud rot previously described by Heald and Wolcott of the Nebraska 

 j^penment Station. It is a disease which is known to occur in New York, 

 Illinois, and Nebraska, and which is attributed to a suedes Sporotrichum with 



~iauon 01 a species of mite 

 disease of tri-acs i-m-,™, n „ 



bulle- 



'n and attributed to the same fungus in association with the same mite, though 

 the relation of the mite to infection has not been completely worked out in either 



case.— F. L. Stevens. 



ioo8 29 ° ES ' ADOLF ' UebCr diC Autol >' sis der Mitosen. Bot. Zeit. 66:89-120. f 



30 Chrysler, M. A., Tyloses in tracheids of Conifers. New Phytol. T-^ 1 * 

 ?*• 5- 1908. 



St, !^ TEWART ' R C > and Hodgkiss, H. E., Tech. Bull. 7, N. Y. Agric E«" 

 Ma. Oct. 19, 1908. 



