1894.] MIOROSCOPIOAL JOURNAL. ^1 



fine objectives, and the.se condensers are open to the ad- 

 ditional objection mentioned in the fore part of this art i- 

 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. 



•2.511 Seward Street, Omaha, Nebr. 



LKTIKKM TO THE EDITOR. 



Note. — Ti/.-- column is open to all correspoudents zvlio -vn'te upon f/tr 

 topics eiiiimeyated loider • Prol>lr»is" or zvho give other information of' 

 ^'ntercsf. The fact that a problem has been answered once need not deter on r 

 friends from making additional comments. To facilitate reference, cor re- 

 spoftdents should cite the number as zvell as the page on xvhich have ap- 

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

 responsible /or the views of others published in this periodical. 



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

 tliiit m11 (if the students have systematic traininsjiii the use of the 

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

 teriology, for which we have new and thoroughly appointed 

 laV»orat()ries. Each man is supplied with a complete outfit, in- 

 (luding a high grade microscope. Each of these courses extends 

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

 eight hours practical work in the laboratory which is as much 

 time as i^eems judicious for undergraduates to spend upon these 

 subjects. E. Fletcher Ingals. Rpgii^tror. 



Chtcaco. 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 

 existing circumstances, of very small and doubtful advantage to 

 lioth authors and publishers, while the importance of improved 

 education is universal and urgfnt and is recognized as a public 

 burden by the heavy taxation endured without objection for it>^ 

 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 manv who are deficient in it, than to 

 patronize with ;irtificial stimulus the few who can and will 



