1904] BRIEFER ARTICLES 461 
formity of sections for the entire class, thus greatly facilitating the work 
of instruction, and conserving the energy of both instructor and 
student.—Amon B. Plowman, Harvard University. 
ANATOMICAL NOTES ON CERTAIN STRAND PLANTS. 
CONTRIBUTIONS FROM THE HULL BOTANICAL LABORATORY, LVIII. 
Tue following notes embody the results of a comparative study of 
the leaf anatomy of certain plants occurring on the Atlantic coast in 
the vicinity of Woods Hole, Mass., and also near Lake Michigan in the 
vicinity of Chicago, Ill. Several of the plants are typical strand 
plants, ¢. g., Cakile americana; others frequently or even generally 
occur at a greater distance from the shore. A similar study ot French 
strand plants has been made by Lesage,’ and the results recorded in 
the present paper largely confirm those of the earlier writer. 
1. Plants growing in the maritime situation are found to have 
thicker leaves than the same species growing inland 
THICKNESS OF LEAF IN MM, 
Plants 
Inland Maritime 
Cakile americana........... 0.76 Pe br, 
Lathyrus maritimus......... 0.28 0.32 
Euphorbia sd, ceging Bees a 0.28 0.38 
ium canadense........ 0.39 0.60 
Atriplex ros Wrap en a tyra ot 0.19 0.49 
ibiscus Moscheutos....... 0.13 0.23 
vos dso e og He eee 0.24 0.31 
olanum nigrum............ 0.31 0.37 
Polygonum eicidiare eee 0.15 0.27 
The foregoing measurements represent average thickness of differ- 
ent leaves and different parts of leaves. Since the Lake Michigan 
specimens were collected in June and the Woods Hole specimens in 
July and August, it was thought that the difference in time of collection 
of the inland and maritime material might introduce a source of error. 
Accordingly additional specimens of several species were secured in the 
Lake Michigan region in October, and these yielded the same measure- 
ments as those collected in June. It will be seen from the table that 
in some cases the maritime form is only slightly thicker than the inland 
form, while in other cases the former is nearly twice as thick. Measure- 
Rev. Gén. Bot. 2:55. 1890. 
