1894.] MICROSCOl^ICAL .TOURNAL. fil 



fine objectives, and these condensers are open to the ad- 

 ditional objection mentioned in the fore part of this arti- 

 cle, they are not susceptible of a sharp focus. Powell & 

 Lealand have furnished a fine condenser of 1.40 numer- 

 ical aperture, but at a high cost, while the new form can 

 be supplied to workers at a low price. All will be thor- 

 oughly tested. 



I shall be glad to correspond with any who wishes fur- 

 ther information upon the matter. 



•2511 Seward Street, "Omaha, Nebk. 



IJ/riKKS TO THE EDITOR. 



Note.— 7"///,v column is open to all correspondents ivho %vrite upon the 

 topics enumerated under '• Problems" or ivko give other information of 

 interest. The fart that a problem has been ansiuertd once need not deter our 

 friends from making additional comments. To facilitate reference, corre- 

 fpondents should cite the number as 7vell as the page on -which have ap- 

 peared letters and queries to zvhich reference is made. The editor is not 

 responsible for the viexvs oj others published in this periodical. 



Rush Medical College. — Replying to your note, I would say 

 that all of the students have systematic training in the use of the 

 microscope, in the branches of Histology, Pathology and Bac- 

 teriology, for which we have new and thoroughly appointed 

 laboratories. Each man is supplied with a complete outfit, in- 

 cluding a high grade microscope. Each of these courses extends 

 through eight weeks, and includes between thirty-two and forty- 

 eight hours practical work iji the laboratory which is as much 

 time as seems judicious for undergraduates to spend upon these 

 subjects. E. Fletcher Ingals, Registrar. 



Chicago, January 18, 1894. 



Tariff on Books. — About the tariff on scientific books I am 

 wholly and cordially opposed to it. It seems to me, under the 

 exi.<*ting circumstances, of very small and doubtful advantage to 

 both authors and publishers, while the importance of improved 

 education is universal and urgent and is recognized as a public 

 burden by the heavy taxation endured without objection for its 

 relief. Even assuming the wisdom of protection as a general 

 policy, it seems to me more important at present to encourage 

 the education of the many who are deficient in it, than to 

 patronize with artificial stimulus the few who can and will 





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