90 GARDENING FOR PROFIT. 



able and portable manure. The experiment was, however, 

 to me rather a costly one ; our past experience told us 

 that there was no reason to expect that the portion, on 

 which the stable manure was used, Avould not be attacked 

 by club-root, as it had borne a crop of Cabbage the pre- 

 vious year, and nearly twenty years' working of that soil 

 had shown that this crop could never be grown succes- 

 sively two years ; but experiments, to be satisfactory, must 

 be done on a scale of some magnitude, and although I lost 

 some $200 by the difference in the crop, I believe it to 

 have been a profitable investment. 



I have incidentally stated that the Cabbage crop, treated 

 in the usual manner, can only be grown every alternate 

 year, the reason of which w T e infer to be, that the insect 

 is harmless to the plant when in the perfect state the first 

 season, but that it is attracted by the plant, deposits its 

 eggs in the soil, and that in the larva condition in which 

 it appears the second year, it attacks the root. Whether 

 this crude theory is correct or not, I will not presume to 

 say, but if it is not, how can we account for the fact of our 

 being able to grow this plant, free from its ravages every 

 alternate year, while, if we attempt to do so successively 

 without the use of lime, it is certain to be attacked? 



All authorities on gardening, that I have had access to, 

 seem to be unaware of the fact that cluVroot is never seen 

 in soils impregnated with shells. This variety of soil is 

 not common. I have never seen it anywhere except here, 

 and as I have before said, this peculiarity of location most 

 fortunately gives a certain clue to the facts, and directly 

 points out the remedy, which, I think, we have found to 

 be in the copious use of bone-dust as manure. 



