186 THE MICROSCOPE 



Fig. 18. — Naupliiis, larval-form of Peneus. 



, 19, 20. — More advanced forms of same. 



, 21. — Adult Sacculina (Female). 



, 22. — Nauplius Sacculina. 



, 23. — Adult Female Lenictocera. 



, 24. — Nau2:)lius of Leraceocera. 



25. — Nauplius of Lepas, or Barnacle. 



, 26. — Adult Barnacle (natural size). 



, 27. — Locomotive "pupa" of Balanus: a., Eye; b., Caudal 

 bristles ; c, Setegerous limbs. 



[Erratum. — p. 88, line i6, for " primula" read "planula."] 



^be flDicroecope anb bow to wbc it 



By V. A. Latham, Late Hon. Sec. U.J.F.C, Norwich. 



Part III. — On Mounting jMicroscopic Objects — confim/ed. 



Staining Wood Sections. 



AFTER the sections have been bleached and thoroughly 

 washed by the methods just described, we may proceed to 

 stain them. This may be done by the use of carmine or 

 logwood ; after which, the sections may be mounted in balsam by 

 the ordinary process. Better effects are, however, produced if we 

 employ the double staining method, for the carrying out of which 

 various kinds and combinations of dyes have been used and 

 recommended. It is needless to enumerate the whole of these 

 here. The agents used are carmine and aniline green, and to 

 carry out the method, solutions of these will be required. The 

 solution of carmine (Beale's) is made by rubbing up in a mortar : 

 carmine (the finest), 1 5 grains (or about i gramme), with a few 

 drops of distilled water ; then adding \ drachm of strong liquor 



