230 



IL Rinse in water and stain in 5% liaenaatoxylin (the time for this 

 varies as the haematoxylin becomes oxidised, but the sections should 

 appear quite black). III. Rinse quickly in water and pass into 10 7o 

 aqueous solution of copper acetate for 60 minutes. IV. Differentiate 

 under the microscope in Weigert's solution — borax 2.0, potassium 

 ferricyanide 2.5, water 100 — , and wash well in running water. Neither 

 of these methods was actually intended for the muscle fibres though 

 they proved so satisfactory, and probably other and simpler methods 

 such as fixation with Zenker or sublimate and staining with iron 

 haematoxylin would give just as good results. 



Bibliography. 



1) Blanchard, Note sur la presence des muscles stries chez les Mol- 

 lusques acephales monomyaires. Revue Internat, des Sc. biol., T. 5, 

 1880. 



2) CouTANCE, De I'energie et de la structure musculaire chez les Mol- 

 lusques acephales, Paris 1878. 



3) Fol, H., Sur la structure microscopique des muscles des Mollusques. 

 Compt. rend. Acad. Sc, 1888. 



4) Knoll, Ph., Doppelt schräggestreifte Muskelfasern. Wiener Sitz.-Ber. 

 Akad. d. Wiss., Math.-naturw. Kl., Bd. 101, 1892. 



5) Marceau, p., Note sur la structure et le mode de contraction des 

 muscles adducteurs des Lamellibr. Bull, Soc. d'Hist. nat. du Doubs, 

 1904. 



6) — , Les fibres musculaires dites doublement strides obliquement. Bibl. 

 anat., T. 17, 1908, p. 108. 



Nachdruck verboten. 



Papille pilifere con propaginl terminal! composte, con propagini 

 ayyentizie e bigemine. 



Del Prof. Sebastiano Giovannini. 



(Clinica Dermosifilopatica della R. Universita di Torino.) 



Con la tavola V. 



Or non e guari ho descritto una prima categoria di papille pili- 

 fere composte, contraddistinte da una base unica, formata dal collo e 

 per lo piu anche da un moncone piu o meno grande di corpo, sulla 

 quale ergevansi aflfatto sciolte da una a sette propagini semplici, para- 

 gonabili per forma alle papille semplici del derma ^). Proseguendo 



1) S. Giovannini, Sull' esistenza nell'uomo di papille pilifere con 

 piu propagini terminali semplici (Papille pilifere composte). Anatom. 

 Anz., Bd. 32, 1908, p. 206. 



