18 



Fig. 2. — Micro-photograph of a section through a bitter-pit spot in 

 the Versfeld variety. The collapsed and thick-walled cells are seen to 

 arise from the vascular bundle which is cut across transversely. Numerous 

 starch grains are present between the collapsed walls, but owing to the 

 low magnification used are not visible in the photograph. 



Fig. 3. — Micro-photograph of a section through a bitter-pit spot at 

 an early stage in its development in the Lord Wolsey variety. The vas- 

 cular bundles in the tissues are cut across transversely. Arising from the 

 upper bundle some enlarged cells are seen, as well as the broken ends of 

 several burst cells. 



Fig. 4. — Micro-photograph of a section through a bitter-pit spot at 

 a fairly advanced stage in its development. Its close connection with 

 the vascular bundle is clearly seen. The indistinct dark masses amongst 

 the broken-down cells are composed of numbers of starch grains imprisoned 

 between the cell walls. (Lord Wolsey variety.) 



