The Microscope. 253 



for microscopical cells, also samples of cells made by this mould. 

 The cells are very neat and must be quite inexpensive. The 

 whole cost of outfit is only one dollar and a descriptive circular 

 will be sent to anyone by addressing Geo. E. Ashby, 103 Maiden 

 Lane, New York. . 



Dr. Geo. Duffield, of Detroit, is certainly wiser than many 

 of us are in one respect at least. He says, in a recent circular, 

 that while he has been glad, hitherto, to examine pathological 

 specimens for his professional brethren without cost, he feels 

 now compelled to charge a moderate fee for all such examina- 

 tions, hoping thereby to get something "for time and materials 

 consumed." 



Dr. James, of the National Druggist, still continues to give 

 us his valuable articles on Microscopical technology. Of late 

 he has been telling us how to prepare, arrange and mount 

 diatoms. There is one good thing about the Doctor's writings, 

 he knows what he is talking about. 



Our Microscopical Laboratory is the richer by the recent 

 arrivals of four " Ideal " stands, from Mr. Walmsley, of Phila- 

 delphia; two histological stands, from Mr. Bullock of Chicago; 

 one stand from Mr. Gundlach of Rochester, and ten low power 

 objectives from the same house. 



At this writing there are two hundred students, in the 

 University, eugagad in microscopical work. Before the close 

 of the college year the number will be more than doubled. 



SELECTIONS. 



CLEANING SLIDES— A VALUABLE DISCOVERY. 



Old and damaged slides are generally handled by micro- 

 scopists are a first-class nuisance, and a question that has fre- 

 quently been asked in the microscopical journals is, how shall 

 they be cleaned? Until very recently, I have advised boiling 

 them in concentrated lye, but I have recently hit upon a much 

 better plan. I take a wide-mouthed jar, of sufficient depth, and 

 half fill it with a mixture of gasoline or benzine, spirits of tur- 

 pentine and benzol. The slides are dropped into this and left 



