1896.] MICROSCOPICAL JOURNAL. 13 



I would suggest a subject say as an example and 

 then have criticism. 



Mode of using Eosin and its results he given in His- 

 tology and Pathology. 



A. Chemistry and varieties. 



B. Solubilities in ale. H2O. 



C. Staining with H^O. Sol. 

 Washing mount. 



D. St. c. Ale. Sol. Mode of after treatment. 



E. Results in Vegtable \ 



F. " " Pathology > Tissues. 

 a. " " Histology ) 



H. Results for Blood of Hg 0. Sol. 



I. Results for Blood of Ale. Sol. 



J. Literature. 



K. Discussion. 



A Modern Microscopic Objective. 

 By henry ORFORD. 



The objective has been ever a source of discussion for 

 microscopists, and also the most difficult part of the in- 

 strument with which the optician has to deal. Years 

 back, when the instrument was known only to a few sci- 

 entists, the question of the construction of the objective 

 was taken up, and many related untenable theories were 

 advanced. Such is the diffraction theory. If this is cor- 

 rect, as some prominent microscopists still believe, all 

 the previous impressions of the older optical principles 

 must be disregarded, also all the writings of the optical 

 physicist, before the diffraction theory became floated, 

 must be put down as useless. 



Dr. Goring pointed out that a larger lens, meaning 

 one with more aperture, would separate the minute 

 markings of scales on a test slide, and that he could get 

 better results with an unachromatized objective of larger 



