thirty years ago, when it suddenly became common and has remained so. Were it again to increase as rapidly our oak plantations would be in a dismal condition indeed. Though these insects will always be looked upon with sus- picion by horticulturists, we must always remember what we owe to a foreign… … forms of the same insect. I have selected a few of the com- tor, which is hidden within their bodies when not in use. Fig. D.—1, Articheke gall; 2, ditto, section; 8, internal gall (magnified), mon and more conspicuous galls for illustration. The vari- They are of avery curious and complicated…
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