APPENDIX A. 129 



directions, on contrary sides of the clear spaces 

 on the minor surface of the tube. The rotation 

 continues in a detached portion, for several days; 

 and if the tube is tied at intervals between the' 

 joints, the fluid between two ligaments still con- 

 tinues to circulate, even though the extremities 

 of the tube should be cut away. The motion 

 here described is precisely similar to what takes 

 place in the tubes of Corallines, and must un- 

 questionably be considered as the result of a 

 vital action." Although the circulation in the 

 laticiferous vessels is denied by many of the 

 most distinguished physiologists, yet the subject 

 is so curious, and so well worthy of farther in- 

 vestigation that it is deemed advisable to add 

 the account of it also in Prof. Henslow's words. 

 " It was in the year 1820, that a distinguished 

 naturalist, M. Schultes, first announced his dis- 

 covery of a peculiar movement in the juices of 

 plants, which more nearly resembles the circula- 

 tion of the blood in animals than any thing 



which had formerly been observed The 



liquid, whose movement is described, and which 

 M. Schultes terms the 'latex,' is sometimes 

 transparent and colorless, but in many cases 

 opaque, and either milk-white, yellow, red, orange, 

 or brown. . . . This liquid is considered tobe 

 the proper juice of the plant, secreted from the 

 crude sap in the intercellular passages, and con- 



