ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 



193 



water together with sulphates and phosphates of ammonia obtained 

 from the host-plant. When ripe the seeds are scattered to a consider- 

 able distance, but little is known as to the conditions necessary for 



z a 



L. 



Pig. 1. — Lougitudinal section of a sucker of L. clandestina, and of 

 the root of Honeysuckle upon which it is fixed. 



cc, central cylinder ; ntr, plr, tracheal cells showing nucleus ; 

 th, hyalin tissue ; j^ad, adhesive papillse ; zab, absorbent zone ; 

 zal, zone of the root-host altered by the parasite ; I, bark ; lib, 

 cortical parenchyma ; b, wood. 



germination. 



^ The food-reserve is sufficiently abundant to enable the 



root and suckers to grow until they become attached to the host. The 

 present work proves that Lathrsea is a genus adapted to subteri;anean 



vb. 



V 0_ 



Fig. 2. — Sucker of L. clandestina upon the rootlet of Heracleum Sphondylium. 



vo, extremity of penetrating cone in contact with a vessel with 

 undulating walls ; vb, vessel filled with a brown substance. 



life, but which has preserved without reduction or degradation all the 

 complex organization of a flowering plant. Water, mineral salts, hydro- 

 carbons and nitrogenous compounds are derived from the host, but with 



