1892.] MICROSCOPICAL JOURNAL. 161 



hibits ot exquisite work in brass and copper and glass that were 

 among the most showy as well as instructive in the exposition. 

 To attempt a description would be to discuss the late progress in 

 the whole prolific specialty of bacteriology, and would fill a book. 

 But the most remarkable exhibit in this class, and the only one 

 which very worthily took a grand prize, was that by the city of 

 Paris, which presented, crowded upon a line of two-story tables 

 in the middle of the hall, a demonstration of the famous work in 

 the biological analysis of air at the municipal observatory at Mont- 

 souris. Not only was the great variety of ingenious apparatus 

 displayed, but the methods of combining and using it, and the re- 

 sults attained, were shown as fully as possible. The publications 

 of the observatory, and of the director, Dr. Miquel. were also 

 presented, and secured a well-earned gold medal for Dr. Micjuel. 



Preparing Apparatus. 



The principal microscope makers exhibited, of course, the 

 usual variety of dissecting, or, according to the better continental 

 phraseology, preparing microscopes. The most important gen- 

 eral exhibit that seemed to belong mainly in this class was by 

 Rud. vSiebert, of Vienna, who displayed a variety of fine labora- 

 tory apparatus, among which the delicate glassware was notable. 

 He also exhibited bacteriological apparatus, mostly of the smaller 

 sorts, in great perfection and variety. 



Microtomes and their accessories formed two special exhibits 

 of nearly equal size and interest^ by R. Jung, of Heidelberg, and 



C. Erbe, of Tiibingen. Both of these exhibits covered a wide 

 range, from the magnificent and costly machines capable of cutting 

 very large sections with the greatest delicacy, to the smaller and 

 simpler afiairs that were carefully contrived and well made and 

 efficient for the general use of students. Both of these makers re- 

 ceived diplomas of honor, the medium models of Erbe being 

 especially complimented for their combination of fine workman- 

 ship and moderate price. 



Of the microtomes offered by the general manufacturers, those 

 by A. Nachet, of Paris, and Chas. Reichert. of Vienna, were 

 most remarkable. 



Microscopical Preparations. 



Perhaps the most famous professional preparer of objects is J. 



D. Moeller, of Wedel, Holstein, whose type slides of 400 diatoms 

 have long been familiar. In addition to a varied selection of ex- 

 cellent diatoms and other mounts, he exhibited his greatest and 

 incomparable production containing at once 4,030 diatoms svs- 

 tematically arranged and accompanied by an atlas of 59 folio 

 plates illustrating the different portions of the preparation. 



Scarcely, if at all, inferior in scientific or commercial impor- 

 tance, were the large and varied exhibits of excellent slides by 

 Edward Tnum, of Leipzig, and J. Tempere, of Paris. The last 



