98 THE MICROSCOPE. 



For replacing objects found out of center we use a needle which 

 has been driven eye first into a piece of soft wood for a handle, and 

 then ground down on two opposite sides until only a thin blade of 

 steel is left, this is to be warmed and inserted under the cover forcing 

 the object back. 



The mount freed from excess of balsam is to be kept in a warm 

 place for about two days, then on the turn table the edge of the 

 mount is given a couple of coats of shellac dissolved in alcohol, or 

 one coat of Bell's cement, to prevent the white zinc which is to follow 

 from touching the balsam. 



After drying another day replace it on the turn table and with 

 pretty thick white zinc cement cover the shellac and edge of cover 

 glass, and apply the color rings at once. For these we use French 

 tube paints mixed in damar and thinned with benzole, thus with once 

 centering on the turn table we have applied the zinc and as many 

 rings as we wish. Allow a day or two for drying, next and last give 

 the whole cement work a coat of best coach varnish which will pre- 

 serve the glassy appearance of the work. It is important that 

 artists brushes of red sable be used. AV'e use No. 8 for the white 

 zinc, shellac, and varnish, and No. i for color rings. 



If other readers of The Microscope will join me in giving their 

 methods of mounting, etc., then I will give my methods of making, 

 easily and quickly neat hard cells of any desired depth for either 

 opaque or transparent mounts, and many other points in mounting. 



Let us help The Microscope and each other by showing up 

 little bugs and the humbugs we have been induced to purchase to 

 mount them with. 



LABORATORY NOTES. 



IT often occurs that some fortunate circumstance gives a man more 

 credit than he really deserves. Thus it happens occasionally, 

 that the microscopist discovers a fraud or diagnoses a disease in a 

 very simple way, but with such satisfactory results that great credit 

 comes to him. We recall a few such cases. 



A physician exhibited, before a small medical gathering, a speci- 

 men he had removed from the interior of the uterus and supposed by 

 him to be "an organized membrane," The specimen was two by 



