1891.] MICROSCOPICAL JOURNAL. 283 



limim^ in which the bacillL instead of presenting the usual rod-like 

 appearance, were broken up into Httle dots or nodules. 



Ed. M. Ehrhorn exhibited some very interesting objects, chiefly scale 

 insects, their enemies and parasites. He showed the voracious cot- 

 tonv cushion scale, Iceryla ptirchasi^ from eggs to imago, together 

 with its natmal enemy, Vedalia cardinalis, or Australian lad} -bug. 

 He also exhibited other noxious insects, as the red scale, the San 

 Jose scale, and their parasites. 



Henry C. Hyde exhibited and explained the various methods of 

 measuring miscroscopic objects, and for the purpose had a stage micro- 

 meter, Jackson's micrometer eye-piece, and the camera lucida. A. H. 

 Breckenfeld exhibited a splendid specimen of Hydra vulgaris, with 

 dark-field illumination, and called attention to the poison glands, by 

 the aid of which its prey is rendered powerless. L. M. King exhibited 

 a drop of water, with a remarkably fine gathering oi Paramecium. 



Charles C. Reidy had under a one-twentieth immersion lens the dia- 

 tom Coscinodiscus asteromphalos, showing the secondary markings 

 beautifull}^ He had also a photograph of the same diatom, recently 

 made by Nelson, of London, which had called forth considerable com- 

 ment at a recent meeting of the Royal Microscopical Society in Lon- 

 don. The image shown to-night was considered fully equal to the 

 photograph. S. E. Taylor had a very fine frustule of Surirella- 

 gemma, shown with a one-twelfth objective, immersion contact. Al- 

 together the meeting proved an unusually pleasant and instructive one. 



Essex County, N. J., C. M. Marvin, Sec'v. 



September 24, i8gi. — Annual meeting. The following officers 

 were elected for the ensuing year : President. Frank Vanderpoel ; 

 Vice-President, Albert Mann, Jr. ; Treasurer, F. B. Carter, and Sec- 

 retary, C. M. Marvin. 



Washington, D. C. 



At the regular meeting of the Washington Microscopical Society on 

 November 17, President Melvin S. Lamb in the chair, it was voted 

 to purchase a Bausch and Lomb stand, with two eye-pieces, 1-6, 2-3, 

 and 2-inch objectives, double nose-piece, and polariscope. The stand 

 is known as the '• Continental." The condenser already owned by the 

 Society will be fitted to this stand. The Society also owns a 1-12 

 homogeneous immersion objective. 



NOTICES OF BOOKS. 



The Microscope and Histology., for the use of laboratory students 



in the anatomical department of Cornell University, by Simon 



Henry Gage, Associate Professor of Physiology. Third edition : 



entirely re-written. Part L The Microscope and Microscopical 



Methods. Illustrated. Ithaca, N. Y., 1S91. Andrus & Church. 



Paper, v$i.oo; half-leather, $1.35. 



There is no nonsense about this book. From the title page to the 



carefully-prepared index and bibliographical list, it exhibits the 



thoroughness that always characterizes Professor Gage's work. 



In the case of more pretentious works it often occurs that by the 



