The Microscope. 



179 



the energy of a few of its members, received a new impetus, and 

 will continue to hold regular monthly meetings. We trust that 

 this society, which numbers among its members so many distin- 

 guished microscopists, will carry on the work with renewed zeal. 

 Reports of its transactions will appear in future in this journal. 



The editorial rooms of The Microscope have been moved to 25 

 Washington Ave. Correspondents and exchanges will please take 

 notice. Specimens for examination, exchange, books for review, etc., 

 should be directed as above, and not to the publishers. 



Acknowledgments. — Mr. B. F, Quimby, of Chicago, 111., for a 

 mount of the Croton-bug, one of the most beautiful insect prepara- 

 tions that we have ever seen. The donor has our apologies for 

 tardy acknowledgments. From Jas. E. Reeves, M. D., Wheel- 

 ing, W. Va., fine slides of the bacillus of typhoid from gelatine 

 culture, and from the 30th potato cultui'e. In the latter case 

 there is a decided increase in size, the potato evidently offering a 

 more acceptable pabulum to the bacterium. 



TECHNOLOGY. 



RYDER'S AUTOMATIC JVnCROTOME, 



Prof. John A. Ryder, of the Biological department of the 



University of Pennsylvania, has kindly fiirnished us with the cuts of 



his new, automatic microtome, which, for price and action, must 



necessarily be considered the 

 best and cheapest instrument 

 now on the market. The fol- 

 lowing description is taken 

 from the American Natural- 

 ist, with additions by Prof. 

 Ryder : 



The working parts are an 

 oscillating lever, which is 

 provided with a 



one end into which the 



paraffine-holders are 



adjusted, and at the 



other with a simple 



handle. This lever 



rests upon trunnions 



on either side, and 



these in turn rest in 



triangular notches at the top of the two pillars between which the 



