ss — Eupatorium ageratoides and coelesHnum. 



ing, and decidedly points to the conclusion that the arti- 

 ficial method adopted is an imperfect imitation of the action 

 of insects, whose visits assure the large percentage of good 

 fruits indicated in the table of statistics. 



The foregoing brief observations point to important lines 

 of inquiry, which the writer may in the future be abl 

 follow out more full v. 



DESCRIPTION OF FIGURES IN I'l.ATK XVIII. 

 Illustrating I.. B. CROSS* paper on Eupatorium. 



Pig. I. Longitudinal section of the corolla of E. ageratoides, show- 

 ing the external surface of two lobes of the corolla hearing papillae, />, 

 on their inner margins, and multicellular hairs, //, on their outer surface 

 X65. 



1'ig. 2. Longitudinal section of the corolla of E. coe/estiuuui show- 

 ing papillae, />, over the margins of the lobes and oval sessile hairs, //, on 

 the external surface. X 65. 



Tig. .;. Stamen of E. ageratoides; a, junction of long, thin-walled 

 cells with b oval, quadrangular, beaded cell wall ; e, process of expanding 

 connective. 



Fig. 4- Cross section of stamen of E. ageratoides. X 6 S- 



Fig. 5. Four of the stamens of E. coelestinum, showing connection 

 and dehiscence. X 65. 



Fig. 6. Pistil of E. coelestinum ; g, nectary ; /, loop in the style ; d, 

 stiginatic surface; d' ', high power view of stigmatic papilla? ; e, sweeping 

 hairs. X 65. 



Pig- 7- g t nectary enlarged. X ^O- 



Fig 8. Longitudinal section of fruit, showing, /, receptacular stalk ; 

 ov, ovule ; ;/, transparent tissue surrounding base of the pappus ; o, base 

 of corolla; g, nectary in section; r, base of style. X 65. 



Fig. 9- Surface view of seed coat showing brown, elongated cells, 

 with pitted areas. X 35°. 



Fig. 10. Cross section through the seed coat showing, i, innermost 

 layer of small, thin-walled cells; k, pigmented layer with pitted mark- 

 ings. X 35o. 



Fig. II. Germinating seedling with fruit wall attached ; g, shrivelled 

 nectary ; ;-, remnant of style. X 35- 



