8 



When the color of the Hower and that of the sap are 

 .similar the resemblances are apparently nearer. Many* 

 plants have laticiferous vessels in which the latex circulates 

 as freely as the blood in the veins. The latex varies in 

 color in different plants, beinu" white, red, purple, or yellow, 

 etc., and is frequently of the same tint as the flower, as 

 seen in Celandine, Tradescantia Virg'inica, Sansfuinaria 

 Canadensis, Apocynum, etc. ; in Sanguinaria the flower is 

 usually white, but sometimes rose color, and in Apocynum 

 the white latex is often tinged like the flower, being white 

 and rose. The latex and colored saj) is apt to vary in color 

 in its course, likewise blood varies from scarlet or crimson 

 to dark purple. 



In a cyclamen with purplish })etioles and scapes, the 

 purple vascular bundles surrounding the central part or pith 

 were traced uninterruptedly from root or bulb to the red 

 purple flower, a cross section of the scape displaying a 

 purple ring, and numerous pur})le dots which were the ends 

 of scattered bundles. Similar colored bundles are to be 

 seen in Primula sinensis, and P. stellata, a cross section 

 showing a crescent ; the l)undles run to the ribs of the 

 leaves, also colored, and u}) to the flower which may be of 

 a different color, or they may be broken, by an uncolored 

 gap, from the flower. All the sap of a beet root is red, and 

 it sup})lies the red petioles and the ribs of the leaves. But 

 of course sap is usually colorless. 



The gratuitous introducti(fn by Mr. Bergen oi the subject 

 of nerves, was obviously for the })urpose of showing an 

 immense difference l)etween animal and vegetable tissue, 

 and the impossibility of any analogy on that account. He 

 is very positive that the redness i)roduced by friction is due 

 to "stimulation transmitted from the central nervous sys- 

 tem" ; but there are serious doubts as to that on the part of 

 the writer. Whither the stimulation is transmitted he does 

 not say, and one is obliged to enquire whether he means 

 that it is sent to the heart, or directly to the reddened skin. 



