323 



p. 52 1 ; p. 268 : Hapale argentata etc. — Simia argentata, Linné, Mantissa 

 plant, 2, Holm., 177 1, p. 521. 



Ich kann noch hinzufügen, daß auch andere Autoren, z. B. Erx- 

 leben und Ken immer Linné 's Mantissa II sehr correct citiert 

 haben. 



4. On the Nervous System of Cestodes^ 



By Wm. L. Tower, Cambridge, Mass., U. S. A. 



eingeg. 27. Mai 1896. 



Having been engaged during the past winter in studying the 

 nervous system of certain Cestodes, I have naturally made use of 

 several of the modern methods of demonstrating nervous tissue. While 

 my results with the Golgi and methylen-blue methods have proved to 

 be of very little value, I have been more successful in the use of vom 

 Rath 's killing fluid and have succeeded by the aid of it in getting a 

 more satisfactory knowledge of some portions of the nervous system 

 than is afforded by the accounts hitherto published. In the matter of 

 nerve terminations, however, I have not made much progress, although 

 my studies supplement in some other ways the recent interesting ac- 

 counts by Blochmann (1895) and by Zernecke (1895) . 



The demonstration of the value of vom Rat h 's fixative in work 

 of this kind, the nature of the material employed, and the determi- 

 nation of some new morphological and histological facts will, I trust, 

 make a short preliminary account of my results worth publishing. 



The Cestodes which I have studied are Mo7nezia expa?isa and 

 M. pianissima from the sheep. This material was taken from the small 

 intestine within twenty minutes after the sheep were killed, and pla- 

 ced in warm normal salt solution (30 — 35° C), in which it remained 

 for thirty minutes, while being taken to the laboratory; it was then put 

 into the following vom Rath 's mixture: 



500 cc. sat. aq. sol. picric acid, filtered. 



3 cc. glacial acetic acid. 



5 gim. platinic chloride in 5 cc. dist. water, 



2 grm. osmic acid crystals. 

 The worms were allowed to remain in this mixture ten hours, 

 were then removed and cut into pieces from one to three cm. long; 

 these were put into crude pyroligneous acid for six to ten hours, and 

 then into 70^ alcohol for twenty-four hours. After dehydration, the 

 pieces were soaked in xylol for twenty-four hours, and then imbedded 



1 Contributions from the Zoological Laboratory of the Museum of Compara- 

 tive Zoology at Harvard College, under the direction of E. L. Mark, No. LXVI. 



