75 



bicollateral bundles, a ring of stereome, and collenchyma in the 

 cortex. Peculiarities of its histology are the irregular number 

 of bundles, the absence of interfascicular cambium, and the great 

 breadth of the medullary rays. An active cambium is found 

 within as well as without the hadrome regions. Scattered sieve- 

 tubes occur in the periphery and an elaborate system of secretory 

 canals adjoins the leptome regions ramifying also through peri- 

 cycle and cortex. In the other stems supernumerary leptome 

 bundles develop, often accompanied by pitted ducts which are 

 cut off from the primary hadrome by the renewed activity of the 

 wood parenchyma. A large periderm gradually forms, its cells 

 finally encrusted with calcium carbonate. 



It is difficult to trace the age of these tubers as the medullary 

 rays are not formed yearly, but judging by the increase at the 

 base of old shoots and by the development of young plants, they 

 may sometimes be the product of half a century of growth. 



The paper was illustrated by drawings and living specimens. 



The paper was discussed by Dr. Rydberg, who mentioned the 



root characters, and geographical range of Cuc2irbita foctidissima. 



C. Stuart Gager, 



Secretary. 

 March 13, 1906 



The Club met in the American Museum of Natural History at 

 8 P. M. President Rusby was in the chair and 13 persons were 

 present. 



After the minutes of the meeting of February 28, were read 

 and approved the following names were presented for member- 

 ship : 



Mr. Ellsworth Bethel, 270 S. Marion St., Denver, Colo.; Mr. 

 T. J. Fitzpatrick, Iowa City, Iowa (Box 497); Mrs. Sarah B. 

 Hadley, South Canterbury, Conn.; Prof. John M. Holzinger, 

 Winona, Minn.; Mr. Robert K. Miller, iii and 113 Chamber of 

 Commerce, Baltimore, Md.; Mr. Eugene A. Rau, Bethlehem, Pa.; 

 Mr. Willard A. Stowell, 140 Kent St., Trenton, N. J.; Mr. C. F. 

 Wheeler, U. S. Dept. of Agriculture, Washington, D. C. 



President Rusby stated that owing to other duties he would 

 be unable to represent the Club at the coming celebration of the 



