It appeared that the attack of lice was simultaneous in Oregon, Washington, and British Columbia, extending over a distance coastwise of more than five hundred miles, and even inland up the Skagit River, where there was an isolated yard.
We found to our cost, however, in the course of time, that the English methods did not suit our different conditions; for while we could kill the lice, we had to use so much spraying material on the dense foliage that, in killing them, we virtually destroyed the hops.