Notes, Reviews and Comments. 89 



the newly introduced and pernicious weeds of the prairie 

 province, Ball Mustard, Neslia paniculata and Tumble Mustard, 

 Tisyinbriuin altissiiniiin, L. ( ' S. Sinapiotrinn, Crantz). In the 

 west owing to the severity of the winter both of these plants are 

 true annuals the seeds germinating in spring and ripening their 

 seeds the same season. 



Mr. W. T. Macoun, who is in charge of the work being 

 carried on at the Experimental Farm with introduced ornamental 

 shrubs and trees, reports that, notwithstanding the past unfavor- 

 able winter at Ottawa, which began with a long period of very 

 cold weather without any snow on the ground until January 

 20th and which on the whole has been more disastrous than for 

 some years there was not, however, as great a loss among the 

 trees and shrubs in the Arboretum, Botanic Garden and orna- 

 mental grounds at the Experimental Farm, as was at first 

 supposed, many varieties having recovered to a large extent ; 

 and at the present date, June 9th, most are looking well. The 

 show of bloom on most of the shrubs has been better so far than 

 it was last year. In the early part of May the trees and shrubs 

 were about a week earlier in blooming than last year, and 

 vegetation is now from two to four days earlier. 



JF. 



Reviews of Recent Geological and Physical Works. 



McGiLL, Anthony, B.A., B. Sc, — " Viscosity in Liquids and 

 instruments for its measurement. Trans. Roy. Soc. of 

 Canada, (new series), Vol. I sect. Ill i8g^-i8Q6, pp. 97-ioj, 

 Montreal, i8gs. 



Separates of this paper were distributed by the author in 

 advance of the volume just issued, June, 1896. The paper is 

 illustrated with diagrams and figures. 



H. M. A. 



