clxxii Journal of Comparative Neurology. 



dyma. It is thus wholly ectodermal. The few elements of connec- 

 tive tissue nature which migrate into the cerebellum with the blood 

 vessels (and in this way alone) are found only in the adventitia of the 

 vessels. 



The transitory superficial granular zone of the cerebellum, which 

 has so long puzzled morphologists, has been fully worked out. Its cells 

 arise wherever the typical cerebellar substance passes over into a sim- 

 ple epithelial layer (transition from the cerebellum into the velum 

 medullare posterius etc.) From these places they wander over the en- 

 tire cerebellar superfices. They are indifferent cells and give rise to 

 both nerve cells and glia cells. The later disappearance of the super- 

 ficial granular zone arises from the centrally directed migration of its 

 elements. It follows, then, from these researches that we have in the 

 cerebellum centres of proliferation from which the histological ele- 

 ments migrate, very much as has been already described for the cere- 

 brum by C. L. Herrick and others. 



c. j. H. 



Nerve Endings in the Hnman Eye Lid. 1 



Professor Dogiel has applied to the border of the eye-lid and the 

 conjunctiva palpebrarum the methyl blue coloration which has al- 

 ready yielded so good results in his hands. He finds terminal organs 

 (Endkolben, W. Krause) similar to those already described in the 

 dermis, in the conjunctiva bulbi and the skin of the external genitals. 

 These terminal corpuscles receive medullated fibres only which arise 

 from a broad-meshed web of medullated and non-medullated fibres 

 lying in the deeper layers. The nerves supplying these corpuscles 

 sometimes anastomose, as in the author's previous cases. Many of 

 the medullated fibres do not enter these corpuscles, but end in a com- 

 plex sub-epithelial meshwork from which arise free inter-epithelial 

 termini. 



The non-medullated fibres supply the Meibomian glands and the 

 blood vessels. 



The Ciliary Body and Iris of Birds. 2 



Vaso-motor, motor and sensory nerves all enter the ciliary body 

 from the circular nerve complex. Tendril-like intra-muscular sensory 



1 Dogiel, A. S. Die Nervenendigungen im Lidrande und in der Conjunc- 

 tiva palpebr. des Menschen. Arch. Mikr. Anat. XLIV, I, Sept., 1894. 



2 Melkich. Zur Kenntnis des Ciliarkorpers und der Iris bei Vogeln. Anat. 

 Anz., X, 1, Sept., 1894. 



