June, 1905.] Embryo Sac and Embryo of BatracMum. 
363 
Fig. 25 — Stigma showing germinating pollen grains. 
Fig. 26 — Young two celled embryo and endosperm. Possibly the remains 
of the second generative nucleus and pollen tube. 
Fig. 27 — Antipodals with five nuclei. 
Fig. 28 — Four celled embryo and persisting synergid. 
Fig. 29 — Single integument, nucellus and embryo, the remains of synergid, 
endosperm, and three nuclei of the antipodals. 
Fig. 30 — More mature embryo showing dermatogen layer and division in 
suspensor cells. 
Fig. 31 — Endosperm from sac of a four celled embryo showing faint 
radiations. 
Fig. 32 — Endosperm cells showing variation in shape and size, a-average 
cells; b-peripheral cells; c-cells near embryo; d-in antipodal 
region. 
Fig. 33 — Embryo sac showing the arrangement of endosperm cells and the 
remains of antipodals. 
Fig. 34 — Closely packed endosperm filled with starch. From an embryo 
sac containing a mature embryo. 
Fig. 35 — Embryo showing rather diagonal division of the suspensor. 
Fig. 36 — Section of older embryo cut slightly diagonal but showing the 
beginning of cotyledons. 
Fig. 37 — Nearly mature embryo showing cotyledons, dermatogen, 
calyptrogen, pleurome and traces of the suspensor. 
P'ig. 38 — Crescent shaped cells of inner wall of carpel and elongated cells 
at right angles to the first; integument and nucellus. 
Fig. 39 — Section of a mature carpel showing these crescent and elongated 
cells hardened and perforate. 
Leaf Expansion of Trees and Shrubs. No detailed record 
of the expanison of leaves was kept for the spring of 1905, but it 
was noted that the beginning of leafing was seven days earlier 
than in the spring of 1904. Syringa vulgaris L. came first on 
March 25, followed by Salix babylonica L., Larix laricina (Du R.) 
Koch, and L. decidua Mill. Some trees were comparatively 
earlier than last year and the order of succession was changed in 
quite a number of species. This was probably due in part to the 
more uniform advancement of warm weather. Mortis rubra L. 
and Chionanthus virginica L. were the last trees to leaf, coming 
out on May G. 
J. H. S. 
