ECONOMIC VALUE OF FUMIGATION 233 
” 
000. There are four nurserymen doing business 
almost as large as the one quoted. On the supposi- 
tion that these four nurseries have about the same out- 
put and that they do four-fifths of the total business of 
the province, the amount of stock sent through Ca- 
nadian fumigation houses would be in the neighbor- 
hood of two and a half million trees. 
Fumigation in Ontario has been limited almost 
altogether to nursery stock, and practically nothing 
has been done on orchard trees. As far as the 
work in the nursery is concerned, I can say candidly 
that I am much pleased with the results. No trace 
of scale has yet been found on stock which has been 
fumigated. It is true that the first year the Act 
was in operation houses were built very hurriedly 
and frequently in a slipshod manner, and fumiga- 
tion was also performed in a half-hearted and be- 
grudging manner by the nurserymen, but I have 
found no trace of scale on nursery stock sent out that 
year. I have made no improvement over the methods 
and equipment outlined by yourself. I still follow 
your formula as amended and your method of con- 
structing fumigation houses. Of course, individual 
nurserymen may have special contrivances for fixing 
the door and providing ventilation. I find by expe- 
rience that the doors and windows are the parts of the 
house which are most apt to get out of repair. 
Dr. James Fletcher, Dominion Entomologist, who 
has had charge of the fumigation houses at the ports 
of entry, writes that in the fumigation of the nursery 
stock in boxes at the border every bit of packing right 
down to the roots is removed, and only the roots are 
