1112 The Hair-Sac Mite of the Pig. (November, 
xilled down to the surface of the ground. Here again growth 
becomes restricted to the axillary buds on these axillary branches. 
This continues from year to year, so that one branch is continu- 
ally being placed upon the other, and each branch becomes 
limited to one year’s growth. And when the result is an appa- . 
rently continuous stem it is called a sympodium. Polygonatum 
giganteum has a sympodium. The stem of /effersonia diphylla 
Pers., is the product of the same sympodial development. 1 
hibernaculum consists of a number of scales followed by a num- 
ber of leaves, in the center of which, terminating the stem, is the 
flower-bud. This alabastrum is so highly developed as to have 
the complete advantage of the leaves, insuring its appearance and 
anthesis before the leaves have received sufficient nourishment to 
force their way to the air. In this way a similar result is pro 
duced to that noted in Anemone and Symplocarpus, where the 
placing of buds in axils beneath the leaf-bearing internodes, 
causes a like appearance of flowers before leaves. ee 
Summary.—The list of plants has now been sufficiently & 
tended to note the principal characters of hibernacula among 
perennial herbs. a 
The winter-buds of herbs consist of scales which owe their or- 
gin to different parts of leaves (blades, petioles)" as in trees. 5 
never attain the indurated character nor the resinous properties í 
scales in arboreal vegetation, but like them are sufficiently aS 
tive to enclose the leaves and flowers of the following year * 
preserve them from the effects of a sudden change of WA 
Unlike the hibernacula of trees, the inclosed parts begin dow 
early in winter, and often break the bounds of their enclosure ie : 
develop and push their way up through the frozen soil. ka by u 
enabled to do this by the supplies of nourishment furn a 
subterranean reservoirs in the shape of thickened stems a R i 
The existence of such winter-buds, containing the flower-bus © : 
the next season, is by no means rare. | = 
:0:— 
THE HAIR-SAC MITE OF THE PIG. 
ABSTRACT BY PROF. R. KAMAN — ae jolie 
N view of the discovery of the hair-sac mite (Dem p3 papel, 
lorum) in the pig in America, a synopsis of Dr. Csokors F 
may be of interest. e w. 
i The scales which envelop the sympodially arranged bud ca a 
fatum are evidently dilated stipules. 
