JOURNAL OF MICROSCOPICAL SCIENCE. 



DESCRIPTION OF PLATE X, 



Illustrating Dr. J. Braxton Hicks's paper on Contributions 

 to Development of the Gonidia of Lichens, in relation 

 to the Unicellular Algse, &c. 



rig. 



1 . — Chlorococcus. 



a, a. Mature, quiescent cell. 



b, b. Segmentation, radiating from centre. 



c, c. Advanced coudition of same. 



d, d. Binary and quaternary subdivision. 



e, Quaternary subdivision, reverting to mature stage. 

 2. — Chlorococcus in various stages. 



a. First appearance of growth of fibre. 



b, b, b. More advanced condition. 

 3. — Mature, quiescent gonidium. 



4. — Formation of soridium. 



5. — „ „ segmentation proceeding at same time with 



fibre-growth. 



6. — Oval cells, the result of segmentation going on to binary sub- 

 division. 



7. — Soridium of Chlorococcus, and also of Lichea. 



S. — Contents of a soridium pressed apart. 



9. — Single, dormant soridium (section of). 

 10. — Soridium in which segmentation has proceeded a certain distance 

 and become dormant (section of). 



a. Segments, numerous. 



b, b. Globular form of subdivisions. 

 11. — Active bodies in cavities in the fibres. 



Figs. 1 to 4 illustrate Mr. Turner's paper on the Minute 

 Structure of the Pancreas, and on the Axis-cylinder of 

 Nerves. 



Fig. 



1. — Portion of injected pancreas under a low power. 



2. — Part of the same, with a much higher power. 



3. — Lobules detached in course of preparation from a portion of pancreas 

 into which the injection has not entered, showing the globular epi- 

 thelium with which they are filled. 



4. Portions of nerves in which the axis-cylinder has become coloured by 

 carmine, the sheath remaining quite free from colour. 



