Scientific America. NOVEMBER 18, 1882.] 327 Or is it the action of the grubin obtaining nourishment from | similar galls, were in many cases really only the differ- GARDEN DESTROYERS.—GALL FLIES OF THE 0AK— ent forms which occur in alternate generations of the same, the surrounding cells? Dr. Adler… … Fig. C.—Oak root gall and section. formation of the gall does not commence unti] the grub is | with sharp jaws) begin feeding a rapid growth of cellsround | | | Fig A.—1, Oak leaf with spangle galls and button galls; 2, button galls (magnified); 3, 4, 5, spangle galls (magnified): 6, grub from…
Internet Archive · Public domain (published before 1931). Free to use for anything.
![An illustration from (Band 3): Der Pflanzenthiere Dreyzehende [Vierzehende, Funfzehende, Sechzehende] Lieferung oder des dritten Theils, erste [zweyte, dritte, vierte] Lieferung (1829)](https://img.insideoutlibrary.com/img/200/heidelberg-esper1829bd3-383-2.webp)
![An illustration from Common objects of the microscope [electronic resource] (1900)](https://img.insideoutlibrary.com/img/200/ia-49492157.2969.emory.edu-87-29.webp)