XXli LABORATORY AND PERMANENT OUTFIT. 



19. Acetic methyl green. To a 2 per cent solution 

 of glacial acetic acid add methyl green until the solution 

 is deeply colored. 



STUDENT'S OUTFIT. 



Each pupil should be provided with the following 

 articles : 1 



20. A Coddington lens or achromatic triplet. Either 

 of these will serve a good purpose. The cheap lenses, 

 mounted in horn, and sold for a dollar or less, are of 

 little use. A good Coddington lens may be purchased 

 of Bausch and Lomb, Rochester, N.Y., for $2.50, and an 

 excellent achromatic triplet of James W. Queen & Co., 

 Philadelphia, for 14.75. 



21. A good pocket knife, kept sharp. 



22. Razor of good quality and medium size, hollow 

 ground. The Torrey razor, manufactured at Worcester, 

 Mass., is recommended. 



23. A pair of fine forceps. 



24. Slides and thin glass covers for mounting micro- 

 scopic objects. The glass covers should be of medium 

 thickness, and not less than f of an inch in diameter. 



25. Needles mounted in handles. 



26. Camel's-hair brushes of medium size. 



27. Note-book and drawing paper. The latter should 

 be unruled, rather heavy, of good quality, and cut to a 

 convenient size for drawings. 



1 In some cases it may be practicable, in order to save expense, for two 

 to use the same outfit ; but the practice is not to be commended, except 

 in case of necessity. 



