58 THE CANADIAN KNTUMoLi )(41ST. 



collecting tour along the south shore of Cumberland Co.. N. S.. a distance 

 of 45 miles. We were in search of plants and minerals, as well. as insects. 

 We started on the 15th of August ; on that day 1 observed two examples 

 of arthcmis, one of which I took. It was sitting on a low shrub, and 

 seemed to be perfectly stupid, making no attempt to escape when 1 put 

 my hand on it. It was a good deal worn and damaged. On the three 

 following days 1 observed quite a number, all in the same condition. At 

 several points they were quite abundant, especially where our road lay 

 through damp woods. Thus, so far as my observation extends, both in 

 New Brunswick and Nova Scotia, arthcmis may be taken occasionally, in 

 good condition, as late as the middle of July, after which date I think few, 

 if any. fresh specimens will be met with. 



I have no doubt that worn and faded specimens might have been 

 found in this county throughout August, or even in September last year. 

 The extreme backwardness of the spring probal)ly retarded the develop- 

 ment of the larvai. and thjis caused the imagoes to be seen later than 

 usual 



CORRESPONDENCE. 



T have used the Pyrethrum powder, " Buhach " mixed with ten parts of 

 tlour, as the easiest and most effectual remedy for the cabbage worm. It 

 was mixed in i88t and remained in the "insufflator" till the past summer 

 without a])parently losing any of its virtue. Its effect w as in no wise 

 diminished. I gave some of the mixture to a friend here whose sheep 

 were infested with ticks, retjuesting him to try it and report to me. He 

 did so, saying that the ticks seemed to enjoy it and he rolled them about 

 in it without inconvenience or injury so far as he could see. 



1 have both kinds, Pyrethrum roscuin and P. c'nicrariifoliNiir^ growing 

 from seed sent me by Prof Riley. 



There are marked distinctions between the plants from the very first. 

 The seed leaves of P. roseiaii are spatulate, those of P. c'uierariifolium 

 are oval. The former throws out a single leaf from between them : the 

 latter throws out two together. The tbliage of the former has a tendency 



* The usual spelling of this word cannot be defended, and is against the analogy 

 of almost every other similar term ot classic origin. 



