JOURNAL OF MICROSCOPICAL SCIENCE. 



EXPLANATION OF PLATE V, 



Illustrating Mr. Sydney H. Vines' Paper on the 

 Homologies of the Suspensor. 



Fig. 1. — A, B, c. Stages in the development of Capsella bursa-pastoris 

 (after Hanstein). 

 e. Embryo, s. Suspensor. h. Hypophysis, and tissues de- 

 rived from it. 



Fig. 2. — Development of embryo of Pinus sylvestris (after Strasburger). 



a. Embryonic cell. b. Elongated cell of suspensor. c. 

 " Rosette cell." d. Cell subsequently formed, taking no 

 part in development of embryo, lying in lower portion of 

 germinal vesicle. 



Fig. 3. — a. b. Stages in the development of Selaginella (after Pfeffer). 

 1, 3, 3, 4, 5. The walls formed in the embryo. 

 s. Suspensor. a. s. Apical cell of stem. a. I. Apical cell of 



leaf. 

 k. c. Hypocotyledonary portion of stem. 

 /. Cells giving rise to so-called foot. 

 r. Cells giving rise to root. 



Fig. 4. — Embryo of Marsilia (after Hanstein). 

 1, 2. Primary septa. 



a. I. Apical cell of leaf. a. s. Apical leaf of stem, r, Root, 

 / Fost. 



Fig. 5. — Embryo of Salvinia (after Pringsheim). 



a. s. Apical cell of stem. a. I. Segment giving rise to scuti- 

 forni leaf. f. Segment giving rise to foot (caulicle). 



Fig, 6. — Embryo of Pteris aquiUna (after Hofmeister). 

 1, 2, 3. Primary septa. 

 a. I. Apical cell of leaf. 

 a. s. Apical stem of stem (both in anterior inferior segment 



of the embryo). 

 /. posterior superior segment, forming foot, together with 



anterior superior segment, according to Hofmeister. 

 r. Posterior inferior segment, giving rise to root. 



Fig. 7. — Embryo of a Liverwort, Grimaldia barbifrons (after Kienitz- 

 Gerloff). 



*. Upper half of embryo forming sporogonium. 

 /. Lower half forming seta and foot. 

 1. Primary septum. 



