706 BOTANICAL GAZETTE [sePreusen 
distribution of the salt. The amount of copper salt needed will never exceed 
one part in a million of water, and since copper is not poisonous to human beings 
in doses of less than perhaps 0.02*" daily, it appears that some fifty quarts of 
treated water might be taken daily with impunity! The paper represents what 
seems to the reviewer to be a most excellent piece of work.—B. E. Liviyestoy. 
Rotrs'® has described several diseases of citrous trees and fruits due to 
Colletotrichum gloeosporioides. When the fungus attacks the young growing 
twigs, into which it gains entrance through the leaves, it produces a disease 
known as “‘wither-tip,’’ characterized by the dying back of the young branches 
The most serious damage is caused to the mature fruit into which the fungus 
gains entrance through an injury or bruise. The fungus rapidly develops until 
the whole rind is brown. This injury occurs to a large extent during the handling 
of the fruit, especially in the coloring process. All varieties of citrous fruits are 
attacked by the fungus. Spraying with potassium sulfid and copper mixtures 
are suggested as remedies, although no experimental data are given. Cultivation, 
fertilization, and pruning are also suggested as preventive measures. — H, 
ASSELBRING 
A RECENT CONTRIBUTION’? from the Gray Herbarium contains six papes 
by the various members of the herbarium staff. The first three, by B. L. Ronit 
son and J. M. GrrEnMan, are “Revision of the genus Sabazia,” chiefly Mexican 
in distribution and containing 6 species; ‘Revision of the Mexican and Centra] — ; 
American species of Trixis,” 16 species being presented, 6 of which are Me | 
and “Revision of the Mexican and Central American species of Hieracium, 5 
of the 19 species being new. The two papers by M. L. FERNALD are Pence 
of the Mexican and Central American species of Alnus,” one of the six — 
being new; and “Some new species of Mexican and Nicaraguan dico 
. . “Th and 
13 being described. A paper by J. M. GREENMAN, entitled Diagnoses # 
paper by J cee si? 
synonymy of Mexican and Central American spermatophytes,” 1 
tions of 39 new species, besides new varieties and discussions of certain 
species—J. M. C. 
Hysrips between Fundulus and Menedia have been investigated 
HAUS.?° The fertilized eggs begin to develop normally, but abn: ae 
appear and the embryos do not develop beyond the closure of grees 
by Mozxe 
+o SOON 
Botanists will be interested in the history of the chromatin. The 
of Fundulus are rather long and straight, while those of Menedia are short 
nd fruits cause OF 
8 Rotrs, P. H., Wither tip and other diseases of citrous trees 4 rene 
Colletotrichum gloeosporioides. Bur. Pl. Industry, Bull. 52. PP- 2 * N.S 0 
«9 Contributions from the Gray Herbarium of Harvard User 
XXVIII. Proc. Amer. Acad. Sci. 40: I-57. 1904. undulus he red 
20 MOENKHAUs, W. J., The development of the hybrids betwen maternal 222 — 
oclitus and Menedia notata with especial reference to the behavior of ees - 
paternal chromatin. Amer. Jour. Anat. 3: 29-65. pls. I-4- i | 
