128 The Ottawa Naturalist. [Oct. 



of Beaver Meadow. 



macracantha Lodd. Glebe; Ottawa South; S. of Dow's 

 Swamp. 



PRAECox Sarg. S. of Dow's Swamp. 



MACROSPERMA Ashe. X ROTUNDiFOLiA Moencli. BiUing's 

 Bridge. 



macracantha Lodd. x macrosperma Ashe. S. of Dow's 

 Swamp. 



MACRACANTHA Lodd. X CRUS-GALLi L. S. of Dow's Swamp. 



MACRACANTHA Lodd. X PUNCTATA Jacq. Ottawa South; 

 E. of Dow's Swamp. 



MACRACANTHA Lodd. X. W. of Dow's Swamp ; Hog's 

 Back; Billings' Bridge; W. of Beaver Meadow. 



NOTE. 



Plants Injured by Creosote. For some time past con- 

 siderable speculation has been indulged in regarding the curious 

 and somewhat m^'sterious malady which has affected many 

 varieties of plants in this city, the leaves turning black and 

 falling before maturity. Roses, delphiniums, laurels, maples, 

 ferns and some other plants, were the principal sufferers. The 

 gardens in the vicinity, to the northward and eastward of the 

 city creosoting plant, were amongst the first to suffer, last 

 season being bad and the present season worse. Then last 

 season the leaves of the eastern maples in front of the Union 

 Club and the Presbyterian Church turned black and fell, and on 

 examination I thought the infection to be of a fungous nature; 

 this season they are only slightly affected, the streets in the 

 vicinity having been paved last year with creosoted blocks. 



A few days ago I was asked to look at the plants on the 

 southern boundary of the Empress Hotel grounds. These I 

 found to be in a very bad state and the suspicions I had enter- 

 tained as to the cause seemed to be amply confirmed, viz., the 

 exhalations from the creosoted blocks in Belleville Street. The 

 plants on the northern boundary next to Humboldt Street, 

 which street was also paved with creosote blocks, are not affected 

 whilst those on the other or northern side, being the southern side 

 of the Macdonald property, are badly affected. Our prevailing 

 winds during the summer are from the south and southwest, 

 and this fact seems to indicate that the creosote exhalations are 

 directly responsible for all the injury. How plants can be pro- 

 tected adjoining newly paved streets I cannot say, but it is 

 certain that much injury to gardens seems likely to result in the 

 future from the cause mentioned. 



Victoria, B.C., 29th July, 1910. J. R. Anderson. 



