i 4 8 THE MICROSCOPE. 



moistened slide the particles removed. After soaking a few minutes 

 the powdery mass will sink, when the cover-glass may be put on and 

 the preparation examined." 



Dr. W. T. Belfield exhibited a series of micro-photographs, rep- 

 resenting crystals of pure and adulterated lard, showing how 

 adulterations may be detected. The crystals of pure lard are long, 

 thin plates, with beveled ends, while those of tallow are plume- 

 shaped. In adulterated lard the feathery crystals of tallow can be 

 detected among the thin plates of lard. 



It could scarcely happen that such a body of specialists should 

 assemble and separate without a discussion on Bacteria, nor did 

 they. Nearly the whole of a forenoon was given to the subject. 

 Papers were read as follows: Preparing and Mounting Bacteria, by 

 T. J. Burrill; Pathogenic Bacteria, by K. J. Detmers; and The 

 Effects of Ozone on Micro-Organisms of Infusions, by Geo. E. Fell. 

 The discussion of these papers was animated. 



Among the biological papers may be mentioned one by Dr. Up- 

 deGraff, on Certain Worms, and among other things, he described a 

 new rotifer, Brachionus Gleasonii. "This brachion differs entirely 

 from any hitherto described, more particularly in its possession of a 

 dorsal horn or spine. The lorica is in the form of an oblong- 

 square, with the two transverse angles, posteriorly, acutely truncated, 

 on the dorsal aspect. From the four acute angles thus formed pro- 

 ject, with a slight inward curve, four spines of nearly equal length, 

 and attenuated at the free extremities. In the median line, one- 

 quarter of the distance from the brow, is situated a horn, curved 

 slightly backward, and of a length corresponding to one-half the 

 length of the lorica. * * * The length of the lorica, independ- 

 ent of the spine, 1-145 of an inch. It is found in stagnant ponds." 



Mr. D. S. Kellicott read short papers in which he described as 

 new Cothurina variabilis, C. lata and Epistylis Niagara; he also gave 

 an account of a Distoma from the liver of the cray-fish and of 

 another form found in the gills and muscles of the same host. 



Dr. Thomas Taylor presented some interesting observations on 

 some " Internal Parasites of the Common Fowl." Three species, 

 two mites and a nematoid, came under the doctor's attention. One 

 mite inhabits the bronchial tubes, the other was found in great num- 

 bers imbedded in the cellular tissue. These mites are known in . 

 similar situations in Europe, but it appears have not been announced 



