1896.) The Life-History of Sequoia. 339 
Bier of e structure the author does not know to occur in 
i the vale the Gymnospermez. The knowledge obtained 
that the Taxa, eal of the sporangia and prothallia indicates 
Bere ot H ete devs been very properly, if Seguota is a 
ily, i phe ; 
Miaddern Coniferse. y, considered as a most primitive group 
Stanford University, California. 
“Ta EXPLANATION OF PLATE XXIV. 
ig. 1. itudi F : ee 
Mot i ena section of sporangium with integument. x 266. 
ig.2, Longitudinal i ; ae 
showi section through sporangium with int 
“6 shee sporogenous cells. 266. A sat Dec. re ere 
X 36. i. © Sango section through sporangium and integument. 
X : 16 Feb. i: : 802. in same section showing three sporogenous cells. 
x ae xt na te de section through sporangium and integument. 
X 178, March gern same section showing one sporogenous cell. 
formed 
E om two sporogenous cells. x 180. March 14, 1 
| alte, howing position 
gium; the resin-duct, 7, does not appear in its full length in 
Ae ¢ 21. January 17, 1892. 
8-7. Median longitudinal section through sporophyll; 7, resin- 
X 21. gonus I . 
thallfs (naiv Ongitudinal section through sporan ivm with male pro- 
(pollen-tubes) and an embryo api. * nbeiee the broken 
followed in a different section, 
; a nucleus at tl 
the antheridial 
», the x go. 2, pollen spore 
thetidial ect tube, drawn from two sections, showing the: divided an- 
ig. 9. =. be es 4. April 8, 1892. 
TY0-sac ongitudinal section through a sporangium containing an 
e a sixteen nuclei in the lower end, of which five appear 
cit in obi; nN; two smaller sacs which wind about the larger one are 
Tuclei, of que section, one of the smaller sacs contains about sixteen 
Fig. 10, three appear in the section. X April 15, 1892. 
‘ftom abou rchegonia from a longitudinal section of a prothallium; 
Nor end: 4 ene orth the length of the prothallium from the ante- 
June 21, 1892 out three-eighths from the ariterior end. x 110. About 
Section of an embryo of eight cells from a longitudinal 
pl July Re Page ata x, ¥, 2, indicate the order of the sections 
Ig, » 1592. : 
orang Longitudinal section through prothallium enclosed in 
by abortive of which the upper one-fourth is shrunken and occupied 
‘USpensors €mbryo-sacs; the upper half of the prothallium contains 
lly 5 ig.) vith embryos; & is the embryo section of fig. 11 *- 
Ig. rr 
eee: 
x tion of a 
ie Rita 
Tawings sketched with an Abbé camera lucida. 
