178 
® 
which Mr. Morong suspects to have originated from a hybrid 
between WV. advena and NV. Kalmianum (N. luteum, var. pumi- 
lum, Gray), which latter is his third species; WV. polysepalum, En- 
gelm., of western America, and N. sagittifolium, Pursh., of the 
Gouthern Atlantic States. 
Osmanthus Americana (Olea Americana). R. Pirotta. “Sulla 
struttura del seme nelle Oleacee.”. (Ann. R. I. Bot. di Roma, 
Pp. 15-17, t. i., fig. 9-10.) 
Outline of Study ap Chemical Botany. Lillie J. Martin. (Botan. 
Gazette, xi., pp. 178-180.) ; 
Pear Blight. a Pougt that Bacteria are the direct cause of the 
disease known as. J.C. Arthur. (Proc. Thirty-fourth Meeting 
A. A. A. S., pp. 295-298; also in Botan. Gazette, x., pp. 
343-345, and in Gard. Chron., xxiv., p. 586.) 
Pig-nut Hickory.—A fine. (Gard. Month., xxviii, pp. 241- 
243; one figure.) 
A tree of this Carya, 113 feet high and 12 feet in circumfer- 
ence § feet above the ground, is reported growing on the property 
of Mr. Geo. W. Childs, in Philadelphia. A good figure is given, 
taken from a photograph of the tree while it was bare of leaves. 
Pinus monophylla. Sir J. D. Hooker. (Gard. Chron., xxvi., p. 
136, fig. 24.) 
Sir J. D. Hooker questions the correctness of Dr. Newberry’s 
conclusion that P. monophylla is but a form of P. edulis (Bull. 
Torr. Bot. Club., xii., p. 50), and adduces personal observations 
in Nevada, as well as experience at Kew, to show that the two are 
specifically distinct. Dr. Hooker states that he is “not aware 
whether their male and. female flowers and cones have been 
critically compared.” 
Pond-scums (Zygnemacee ).—The Question of Bistcuasiny in. the. 
C. E. Bessey. (Proc. Thirty-fourth Meeting A. A. A. S., p. 
291 ; abstract.) 
Professor Bessey concludes that these plants possess undifferen- 
tiated sexuality, and may be designated unisexual; also that they are 
to beclassed with the lower Thallophyta, but little above Protophyta. 
Prothallium of Ferns. Douglas H. Campbell. (Proc. Thirty- 
fourth Meeting A. A. A.S., pp. 292, 293, abstract; published 
in Botan. Gazette, x., pp. 355-360; plate ix 
