204 
The Ohio Naturalist. 
[Voi. VIII, No. 1 
Fig. 11. 
Fig. 12. 
Fig. 13. 
Fig. 14. 
Fig. 15. 
Fig. 16. 
Fig. 17. 
Fig. 18. 
Fig. 19. 
Fig. 20. 
Fig. 21. 
Fig. 22. 
Fig. 23. 
Typical microspore of same date. 
Longitudinal section of an anther, showing the frothy gela¬ 
tinous substance about the pollen grains. The anther walls 
consist of the epidermis, endothecium, two intermediate lay¬ 
ers, and the tapetum. January 29, 1906. 
Section of a two-celled pollen grain. Apiil 30, 1906. 
Longitudinal section of an ovule, showing the archesporial cell 
which is the megasporocyte. August 18, 1906. 
Longitudinal section of an ovule, showing the three small, non¬ 
functional megaspores and the large functional one. August 
26, 1906. 
A longitudinal section of a megasporangium, showing two- 
celled embryo-sac with the disorganizing nuclei of the three 
vestigial megaspores. September 2, 1906. 
The ovule cut longitudinally, showing the four-celled embiyo- 
sac with a few of the many disorgianzing nucellar cells shown. 
September 8, 1906. 
Longitudinal section of an eight-celled embryo-sac, showing the 
long dense cone, a trace of the egg nucleus lying just below 
the synergids, the large definitive nucleus below the egg, the 
three small antipodals and a few of the disorganizing cells of 
the nucellus. May 21, 1906. 
A tip of an eight-celled embryo-sac, showing the contorted 
ridges on the cone. The egg lies in the median line just below 
the svnergids with the definitive nucleus at its side. May 
21, 1906. 
Another figure, to show the double point of the cone of the 
embryo-sac, the definitive nucleus lies at the side of the egg 
in this one also. May 21, 1906. 
A young embryo with suspensor below the cap of endosperm 
tissue. July 9, 1906. 
Outline sketch of a young embryo, showing the cotyledons, 
root tip and fragment of suspensor. July 21, 1906. 
Outline sketch of an older embryo with cotyledons, stem tip, 
root tip and root cap. July 28, 1906. 
Addition to List of Dragonflies of Canada.* 
Under date of June 3, 1907, Mr. E. P. VanDuzee kindly calls 
my attention to an omission in the paper cited. In the 
list of papers relating to Canadian dragonflies I omitted Mr. 
Van Duzee’s paper, List of Dragonflies Taken Near Buffalo, 
N. Y., Journ., N. Y., Ent. Soc., Vol. V, June , 1897, pp. 87—91, 
in which, he records the capture of Anomalagrion hastatum Say at 
Point Abino, Ontario. I failed to list this with the other Cana¬ 
dian species. 
Bluffton, Ind. E. B. Williamson. 
The writer would be pleased to receive reports of any obser¬ 
vations on the southward migration of the Monarch Butterfly 
(.Anosia plexippus) during the early part of October. 
Herbert Osborn. 
♦Published in Ohio Naturalist, Vol. VII, No. 7, May, 1907, pp. 148-150. 
