1895.] MICROSCOPICAL JOURNAL. 113 



microscope for aid in detecting forgeries, erasures, etc., 

 as well as in detecting crime is also well represented. 

 And finally there is no modern publication in which is 

 more fully and satisfactorily discussed the. principles 

 underlying exact standards of length, a subject vital to 

 every user of the microscope, for if his micrometers are 

 not exact, his work must necessarily in so far be defec- 

 tive. The University possesses one of Rogers' dividing 

 engines and the department of Physics has kindly prom- 

 ised to show the members exactly how micrometers are 

 made. There is also a large comparator for carefully 

 testing micrometers after they are made. This one was 

 actually used in determining the exactness of the rulings 

 of our standard centimeter. 



A special feature of the coming meeting will be the 

 setting apart of one or more sessions for the reading of 

 papers on methods and the demonstration of special or 

 new methods. The chairman of the local committee, 

 Professor W. W. Rowlee, or the president will be glad 

 to receive requests from those who desire to have some 

 specially difficult method or structure elucidated, and an 

 eff'ort will be made to get some member particularly ex- 

 pert in such subject to demonstrate it before the Society. 



President Gage will be upon his own ground and all 

 may rest assured that his enthusiasm for and energies 

 in behalf of this meeting will guarantee a profitable time 

 to all who come. The opportunity to observe his 

 methods in his own laboratory is a privilege none could 

 aff'ord to lose even if there were no other attractions. 



Please make plans at once to be present, to help bring 

 new members, and to make the next meeting worthy of 

 the Society. 



[Those who purpose attending ought to begin the prei^- 

 aration of papers at once and let their good intentions be 

 known to others. Such purposes are infectious, but in- 

 difference is also infectious. We shall watch and report 

 the preparations without fear or favor. — Editor.] 



