Objects for the Microscope. 193 



a few would be most useful to a young student, who thus 

 might learn what to mount for himself at the sea-side. 



As to the method ; when the form only of the plant is 

 desired I find Canada balsam a good medium. The Sea- 

 weed being perfectly dry, it only requires placing in warm, 

 not hot, balsam, and covering with a previously warmed 

 thin glass cover. But for the display and preservation of 

 the fructification the following liquid is preferable : 



GOADBY'S SOLUTION FOR MARINE ALG.E. 



Four oz. bay-salt, two oz. alum, four grains corrosive 

 sublimate, two quarts of boiling water. 



A cell is to be made on the revolving table with Bruns- 

 wick black, and thoroughly dried. The specimen then laid 

 in the cell with enough of the solution to fill the cell, and 

 the glass cover carefully laid on. Let it stand for a few 

 minutes, and dry the surrounding glass with blotting paper 

 before the varnish is applied, which hermetically seals it. 

 The Sea- weed must be mounted fresh from the sea. 



