ZOOLOGY. 493 
formation, however, which is referred to, is exactly what occurred, 
to the mind of the writer, upon reading the item concerning shad 
eggs; but he was diffident about expressing it, until meeting with 
the above confirmation, both of the fact and of the explanation. 
There are few cases more satisfactory, in favor of the correlation 
between life-force (growth-force, bioplastic force) and the other 
physical forces, than heat. — H. Hartsnorne, Philadelphia. 
Axoraer Nore on THE Same.—My idea is that germination in 
the seed of plants requires heat, so does the impregnation of the 
eggs named. Hence the absorption, so to speak, of the heat from 
— the water. We all know that conception in the animal requires 
heat, making the conclusion above obvious. —N. COLEMAN, 
Otsego, Michigan. 
: Nest ayp Ecos or Hetamxruornaca Luciæ.— This interesting 
little bird was discovered in Arizona, and first described, by Dr. 
Cooper (Proc. Cal. Acad. 1862, 11, 120) and afterward written 
about by the same gentleman (B. of Cal. 84), by Bard (Rev. 178) 
and by ourselves (Ibis, 1866, 260; Proc. Phila. Acad. 1866, 70) ; 
= is its record, up to date, the nest and eggs remaining unknown. 
Lieut Charles Bendire, U.S.A., writing to us from his camp near : 
Tueson, Arizona, May 19, 1872, says: “I found to-day the nest 
of a very small warbler, four inches long, which has a bright chest- 
nut spot on the crown, and the tail coverts of the same color, the 
e upper parts cinereous, the lower parts dull white. I cannot 
be it in Baird’s work. The eggs, four in number, are nearly 
globular in shape, and hardly larger than those of a hummingbird, 
White, with fine red spots on the larger end. I am afraid I shall 
brie to save them, as they contain large embryos. The nest 
AS placed between the bark and main wood of a dead mezquite 
tree, about four feet from the ground.” — Exirorr Cours. 
Fl or Covcn’s FLYCATCHER IN THE UNITED STATES. 
Em Same valued correspondent speaks of finding this bird near 
oe i it has not, I believe, been hitherto taken north of Mexi- 
ü t is a slight northerly variety of the Tyrannus melancholi- 
SS; a species of wide distribution in Central and South America. 
~aELlorr Covgs. 
The Foon or THE Brack Brear.— A few days ago I secured 
