316 CHAPTER XXIV. 



which he finds it superior to all other agents. It is also re- 

 commended for the same purpose by NANSEN (v. Zeit.f. wiss. 

 Mik., v, 2, 1888, p. 242). 



530. Permanganate of Potash. Has an action similar to that 

 of osmic acid, but more energetic. Is recommended, either 

 alone or combined with alum, as the best dissociating agent 

 for the fibres of the cornea (ROLLETT, Strieker's Handbuch, 

 p. 1108). 



531. Chromic Acid. Generally employed of a strength of 

 about 0'02 per cent. Specially useful for nerve tissues and 

 smooth muscle. Twenty-four hours' maceration will suffice 

 for nerve tissue. About 10 c.c. of the solution should be 

 taken for a cube of 5 mm. of the tissue (RAN VIE ii). 



532. Bichromate of Potash. O2 per cent. 



EISIG (Fauna u. Flora Golf. Neapel, 16 Monog.,1887, p. 297) 

 macerates Capitellidee in 0'5 to 1 per cent, solution for months 

 or years, a little thymol being added against mould. 



533. Muller's Solution. Diluted to same strength. 



534. Muller's Solution and Saliva (see above, 528). 



535. BROCK'S Medium (for nervous system of Mollusca, 

 Intern. Monatssch. f. Anat., i, 1884, p. 349). Equal parts of 

 10 per cent, solution of bichromate of potash and visceral 

 fluid of the animal. 



536. MOBIUS'S Media (Morph. Jahrb., xii, 1887, p. 174). 



1. One part of sea water with 4 to 6 parts of 0'5 per cent, 

 solution of bichromate of potash. 



2. 0'25 per cent, chromic acid, O'l per cent, osmic acid, 

 O'l per cent, acetic acid, dissolved in sea water. For Lamelli- 

 branchiata. Macerate for several days. 



537. GAGE'S Picric Alcohol (Proc. Amer. Soe. of Microscopists, 

 1890, p. 120 ; Zeit.j. wi*s. Mik., ix, 1, 1892, pp. 87, 88). 95 

 per cent, alcohol, 250 parts; water, 750; picric acid, 1. 



