PLATE XI. 



Fig. 36. — A second wedge-shaped rootlet bundle, like fig. 35, PI. IX, from the 

 exterior of the large vascular cylinder from Staffordshire. Protoxylem vessels,/'. 

 X 80. Cabinet, No. 750. (Pages 23, 24, 34.) 



Fig. 54. — Transverse section of the rootlet bundle with its bundle cylinder, of a 

 very young rootlet. Very small Tracheids at the point of departure of the monarch 

 rootlet bundle,/,/". Bundle cylinder, /'. x 100. Cabinet, No. 831. (Page 29.) 



Fig. 55.— A second rootlet bundle, like Fig. 54. X 100. Cabinet, No. 829. 

 (Pages 29, 31.) 



Fig. 56. — A third, more advanced, rootlet bundle, like Fig. 54. X 100. 

 Cabinet, No. 775. (Page 29.) 



Fig. 57. — Vascular bundle,/, and part of the bundle cylinder,/", of a larger 

 and older rootlet. Point of departure of the monarch bundle, /'. X 100. 

 Cabinet, No. 836. (Pages 29, 31.) 



Fig. 58. — Rootlet bundle,"/, and its cylinder, /", of a yet older rootlet. X 100. 

 (Pages 29, 31.) 



Fig. 59. — Rootlet bundle, /, with part of its monarch initial vessels at/', but 

 with two others yet deeper amongst the cells of the bundle cylinder at /"'. 

 (Page 29.) 



Fig. 60.— Rootlet bundle, with part of its bundle cylinder, /". The more 

 recently added of the vessels of the bundle, /, radiate from the monarch point of 

 departure at X 100. (Pages 29, 30.) 



Fig. 61. — A second rootlet bundle, like Fig. 60, with its initial vessels at /', and 

 a small portion of its cylinder at/". Here again the vessels of the older part of 

 the bundle are non-radial; the younger additions are disposed radially. X 100. 

 Cabinet, No. 651. (Pages 29, 30, 34.) 



Fig. 62. — Transverse section of a very young bundle, /, with its phloem 

 elements preserved at/"'. Bundle cylinder,/". (Page 32.) 



Fig. 63.— Transverse section of a rootlet about to dichotomise. Inner border 

 of the cortical zone of the rootlet, g. Fistular cavity of the rootlet, g . Two 

 bundles, /, /, each surrounded by its bundle-sheath or cylinder, /', /', resulting from 

 the division of one single bundle. X 75. Cabinet, No. 862. (Page 32.) 



