Journal of bacteriology . arious species of flies are thought not to be active agents in transmit-ing infection though they may be important in carrying the organismto blossoms or to wounds. The experiments included the followingsuspected carriers: Pollenia rudis, Empoasca mali, Psylla pyricola,Plagiognathus politus, Sapromyza hispina.—F. L. S. Citrus Canker. F. A. Wolf. (J. Agr. Res. 6, 69-99.) A serious citrus disease has recently been introduced into the GulfStates, known as citrus canker. The primary cause is Ps. citri Hasse,an organism with a single flagellum, shown by the writer to have
Journal of bacteriology . arious species of flies are thought not to be active agents in transmit-ing infection though they may be important in carrying the organismto blossoms or to wounds. The experiments included the followingsuspected carriers: Pollenia rudis, Empoasca mali, Psylla pyricola,Plagiognathus politus, Sapromyza hispina.—F. L. S. Citrus Canker. F. A. Wolf. (J. Agr. Res. 6, 69-99.) A serious citrus disease has recently been introduced into the GulfStates, known as citrus canker. The primary cause is Ps. citri Hasse,an organism with a single flagellum, shown by the writer to have thegroup number Ps. 221. 3332513. It attacks both twigs and of the genera Phoma, Fusarium and Gleosporium have been foundassociated with this organism, although the Phoma is the only onefound to be notably active in disintegration of the tissues. The onlymethod of control recommended is by means of quarantine and thoroughdestruction of diseased trees.—H. J. C. De KhotinskyFixing and Hot Staining Apparatus. No. 8049A Electrically Heated This apparatus meets the need for a clean and neat apparatus for hot staining. Byits use it is possible to fix the smears of sputum, etc., without danger of burning, to stainthem without danger of boiling the carbolfuchsin solution and also to avoid dropping carbol-fuchsin over the laboratory tables and floors. It consists of an asbestos wood frame withbase which will stand red heat without destruction. In the bottom is a sliding metal shelf,to be filled with sand for catching any drippings and to aid in reflecting all the heat upwardfrom the heating units, of which there is one for every two slides. These units, which areeasily replaceable, are made of lavite, bound with nichrome wire, which is insoluble in boil-ing carbolfuchsin. The slide carriers are nickel-plated brass frames made to fit in the as-bestos frame at a suitable height above the electrical units. The base is provided withleveling screws. A set of fuses is placed
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