1892.] THE MICROSCOPE. 173 



the embryology of the chick, were projected upon the screen with 

 good effect. 



Several collections that were not remarkable as photographs 

 were interesting, and perhaps even more valuable as demonstra- 

 tions of natural history or of economic science, and as examples 

 of thorough and useful scientific work. Such was the comparative 

 study of the structure of oily seeds by Director Fred. D'Hont and 

 Mr. F. JNIoreau, of the communal laboratory at Courtrai, Belgium, 

 illustrated with six large frames full of photographs (x loo), and 

 with a side case displaying a set, complete in every detail, of the 

 few simple instruments, reagents, etc., used in the investigation. 

 A somewhat similar study of the comparative histology of the 

 seeds of the cabbage, mustard, flax, and other plants of com- 

 mercial importance was shown by Director Paul Claes and Mr. 

 Emile Thyes of the state agricultural laboratory at Louvain. Mr. 

 Ed. Anseel, of Antwerp, likewise exhibited a set of three dozen 

 views, adequately magnified, demonstrating the character of the 

 hairs of difierent animals. It would be difficult to commend too 

 highly the educational and economical value of this class of 

 work. 



Bacteriology. '^ 



The two principal exhibits in this class consisted of extensive 

 selections from the vast variety of apparatus made by E. Adnet 

 and by V. Wiesnegg, both of Paris. The sterilizing and incubat- 

 ing ovens, baths, furnaces, and lamps, stills, filters and refrigera- 

 tors, and the large variety of associated apparatus constituted ex- 

 hibits of 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 bacteriologv, 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-storv 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. Miquel. 



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 



