58 THE AMERICAN MONTHT,Y [Feb 



Wash well in methylated alcohol until no more red color 

 comes away ; rinse in water, and, still holding- the cover 

 slip with the forceps, drop a watery solution of methylene 

 blue upon the film and allow it to stain for thirty seconds. 

 Drain off the stain, wash rapidly in water ; press g-ently 

 between folds of blotting- paper, and allow it to dry in the 

 warm air above the flame at such a heig-ht that the hand 

 can be easily held there. Mount in xylol balsam. Tuber- 

 cle bacilli will be stained red by the fuchsine ; all other or- 

 ofanisms will be colored blue. A very convenient and use- 

 ful method for the preliminary staining- and examination of 

 any smear preparation, is to mount it, when fixed, in a drop 

 of Loffler's methylene blue and remove all surplus stain 

 by g-ently pressing- a piece of blotting- paper upon the 

 specimen. Microbes, cell nuclei, etc., take upthe dye very 

 readily, and show up well althoug-h mounted in the dye 

 itself, which in such a thin film appears almost white by 

 contrast. 



Baker's Number One, D. P. H. Microscope. — Mr. Chas. 

 Baker, London, has adopted the lever form of fine adjust- 

 ment, which, orig-ially so adversely criticised, has now 

 justified its existence as being- one of the most delicate,yet 

 steady and reliable adj ustments made. The form of tripod 

 foot is steady and g-ives more room than usual for the ad- 

 justment of the under stag-e arrang^ements. The micro- 

 scope is fitted with the usual focussing- and centerings sub- 

 stag-e, swing-ing- tail-rod of mirrors, draw-tube, etc., and 

 with addition of the excellent mechanical stag-e costs $53.25. 

 Without this last, but with the Nelson type of horse-shoe 

 stag-e, fitted with sliding- bar, the microscope costs $42.00. 

 This instrument can be strong-ly recommended both for 

 workmanship and desig-n, for all purposes of orig-inal re- 

 search. 



Cement for Glycerine Mounts. — In making- permanent 

 specimens of objects mounted in g-lycerine or Warrant's 

 medium, considerable difficulty is experienced in cement- 

 ing- the cell. I have tried various methods, but the most 

 successful in my hands has been to use a thick solution of 



