Osyris, Loranthus and Viscum. 213 



represented in the drawing), in none of which were inner tubes detected: two 

 of these were cellular at their lower free ends, and one remained in its original 

 state. 



Fig. 8. An ovulum at a somewhat later period, partly dissected away from the closely- 

 adhering tissue of the interior of the ovarium. The lower parts of two sacs are 

 shown, of which one is torn up, disclosing the two inner tubes. 



Fig. 9. The young seed, dissected out. In this instance, of three sacs two retained their 

 original appearance, and did not even assist in the formation of the cellular mass, 

 the subsequent albumen. This, as well as the embryo, which is of some size, 

 belongs to the central sac, in which pollen tubes are visible. The young albu- 

 men, allowance being made for its having been dissected partly so as to expose 

 the embryo, appears of somewhat confervoid growth. 



Fig. 10. Portion of a seed, more advanced, with the albumen cut away except at the base. 

 At this period the base of the albumen (the original cellular mass in which the 

 young embryo was formed) is of a laxer nature than the rest, from which it is 

 sufficiently distinct. 



Tab. XXI. 



Loranthus hicolor. 



Fig. 1. The second cellular sac from the ovarium figured in Tab. XX. fig. T, magnified 

 about 200 times. 



Fig. 2. A fertiUzed sac of another ovarium, about the same period, a. Its constricted upper 

 end, where it becomes engaged in the canal of the style, b. What I take to be the 

 situation of the original free end of the sac, beyond which the inner tubes extend 

 very httle. In this, as in most other instances examined, the articulations of the 

 inner tubes become shorter and more frequent from the commencement of the 

 ceUularity of the sac. 



Fig. 3. A young seed, somewhat more advanced than that figured in Tab. XX. fig. 9. Of 

 the three sacs represented as assisting in its composition, two have inner tubes, 

 the growths from which pass through the cellular body and reach its lower sur- 

 face, which is obscured by adhering grumous tissue. The third sac, although 

 cellularly subdivided to a considerable extent, remained unfertilized. 



Fig. 4. Young seed more advanced than that figured in Tab. XX. fig. 9, with the albumen 

 laid open to expose the embryo. 



Viscum. 



Fig. 5. Longitudinal section of a female flower before expansion, a. Outer or bracteal layer. 

 b. Point of insertion of perianthium. c. Lageniform central tissue, d. Opake 



2 f2 



