THE MICROSCOPE. 151 



lently shown. Special tables were skillfully arranged for the con- 

 venience of the microscopists and the guests; they occupied two 

 large and elegantly furnished parlors. There were two hundred 

 and fifty microscopes in place. By the side of each instrument was 

 a card bearing the name of the microscope, its owner and that of 

 the object exhibited from 8 to 9 o'clock and of another from 9 to 10 

 o'clock. Much credit is due to the local committee on soiree, B. F. 

 Nourse, chairman, for the very complete arrangements. The society 

 by resolution expressed its appreciation of the courtesies of the 

 Calumet Club. 



The place fixed upon by the executive committee for next 

 year's annual meeting is Rochester, N. Y.; the exact date will be 

 announced as soon as determined upon. 



The officers for the Rochester meeting are: President, Hon. 

 Jacob D. Cox. Cincinnati; vice-presidents, Prof. Wm. A. Rogers, 

 Cambridge, and Prof. T. J. Burrill, Champaign, 111.; secretary, D. S. 

 Kellicott, Buffalo; treasurer, Dr. Geo. E. Fell, Buffalo; members of 

 the executive committee, Prof. A. H. Chester, Clinton, N. Y., Gen. 

 Wm. Humphrey, Jackson, Mich., and Dr. H. A. Johnson, Chicago. 



The display of the latest and best apparatus by manufacturers 

 and dealers was fully up to the standard of former years. The fol- 

 lowing were represented: 



W. H. Walmsley, Philadelphia Pa.; Jas. W. Queen & Co., 

 Philadelphia, Pa.; Bausch & Lomb, Rochester, N. Y. ; L. R. Sexton, 

 Rochester, N. Y.; L. D. Mcintosh, Chicago, 111.; W. H. Bullock, 

 Chicago, 111. 



[Continued from page 100.] 

 SENSITIVE DENTINE. 



BY A. M. ROSS. 



THESE facts are easily demonstrated under the microscope and 

 by their aid we more readily understand why sensitiveness 

 under the instrument lessens as advance is made into the sound 

 dentine, and again we are taught that the fresher the specimen, the 

 fewer reagents to which it is subjected, the more valuable it is. 



It is well known that progressing dental caries ultimately 

 causes exposure of the pulp, the period of time necessary to bring 

 about this result, depending, of course, upon the character or rapidity 



