490 ON THE WOOD OF INDIAN SPECIES OF PINUS. 
Fig. 31. Tissue adjoining resin-duct (which lay to the left), longitudinal section. 
32. Uniseriate medullary ray, tangential section. 
33. Fusiform medullary ray, tangential section. 
34, Medullary ray, and bent wood-tracheids, in spring-wood, radial section. 
35. Spring-tracheid, radial section. 
36. Summer-tracheid, radial section. 
37. Medullary ray, showing pits of ray-parenchyma, radial section. 
Pinus Merkusit. 
Fig. 38. Wall of spring-tracheid, tangential section. 
39. Uniseriate medullary ray, tangential section. 
40. Fusiform medullary ray, tangential section. 
41. Medullary ray with lobed marginal ray-tracheids, radial section. 
42, Tissue adjoining resin-duct (which lay to the left), longitudinal section. 
43, 46-48, Spring-tracheids, radial sections. 
44. Late spring-tracheid or early summer-tracheid showing the last trace of 
Sanio's rims, radial section. 
45. Medullary ray in summer-wood, radial section. 
49. Summer-tracheid, radial section. 
50. Medullary ray in spring-wood, radial section. 
