248 The Microscope, 



Do not stain more than two or three sections at a time, and be 

 sui'e that they are carefully arranged in the staining-fluid. All f olda 

 and wrinkles should be removed, to allow even action on all surfaces. 

 With hsematoxylin particularly, a wrinkled section will be ruined. 



Naclei can be made prominent by over- staining, and then remov- 

 ing the superfluous color with reagents. Leave a section in carmine 

 till it possesses a dark carmine color. Now wash thoroughly iti thia 

 fluid: 



Hydrochloric Acid, 5. 



Alcohol, 55. 



DistUled Water, 35. 



It will bleach the specimen, the color coming out from all por- 

 tions excepting from the nuclei, which will then show up most bril- 

 liantly. The same liquid may be used with hsematoxylin. 



As a rule, a section stained slowly in a weak fluid will do better 

 than one stained quickly in a strong one. This is especially true of 

 the carmines. 



The reader is advised to practice carefully with these stains^ 

 timing each section, and inspecting the result, and thus learning the 

 exact exposure required. With a little practice, though the begin- 

 ning be discouraging, success will soon be attained. 



EDITORIAL. 



THE TENTH ANNUAL MEETING OF THE AMEKICAN 

 SOCIETY OF MICROSCOPISTS. 



AUGUST 14th, 1878, there met in Indianapolis a National 

 Microscopical Congress, instituted at the instance of the 

 Indianapolis Lyceum of Natural History, with the purpose of form- 

 ino- a National Association. Among those present were a larg& 

 number of the prominent microscopists of this country. A commit- 

 tee on permanent organization was appointed by the President of the 

 Convention, Dr. R. H. Ward, of Troy, N. Y., and from the endorsed 

 action of this committee sprang the American Society of Microscop- 

 ists. With its subseq ient growth most of oui' readers are familiar, 

 and to-day know it as a body of far-reaching influence and steady 

 progress. 



We have received from Dr. D. S. Kollicott, Secretary of th& 

 Society, a circular giving the arrangements for the tenth annual 



