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A Method by Which Cover Glasses May be Used 

 ON GoLGi Slides. 



By D. W. Dennis. 



It has been well known for many years that Golgi slides of the brain, 

 spinal cord, etc., will go bad if a cover glass is put on them. 



Several years ago serial sections of a mouse's brain were prepared by 

 this method in the Earlham laboratory by Mr. Levi Peacock. Three years 

 ago I concluded to sacrifice one of these slides in order to get a medium 

 power photograph of some Purkin.ie cells, so the balsam was warmed and 

 the cover glasses put on. Last summer the slides were still in excellent 

 condition. I accordingly had cover glasses put on all the slides last winter 

 and they are still all in good conditicm. How long a time must elapse after 

 a slide is made before it will bear a cover glass without damage we shall 

 now work out. 



