594 
BIBLIOGRAPHY. 
and, indeed, the innermost of these, retained the power of repro¬ 
ducing tissue when mutilated. It was found that the deepest 
parenchymatous zones and even the medullary canal could re¬ 
produce woody bundles and a cortical tissue, and that wherever 
the cells were yet active, or retained sufficient vitality, vessels 
and fibrous fascicles were formed. 
Hetet, M.—Liste des Plantes qui ont resiste en plein air, depuis 
plusieurs annees, au Jar din botaniques de la Marine a Brest. 
Ibid. p. 879. 
Heitffel, J.—Fragmenta Monographiae Caricum in regnis Hunga- 
riae, Croatiae, etc. sponte nascentium. Linnaea, xxxi. p. 659. 
With 2 plates. 
Hildebrand, P.—Ueber einige Falle abnormer Bliithenbildung. 
Bot. Z. 1862, p. 209. With a plate. 1. Monstrous flowers of 
Convallaria majalis. 2. JPeloria of Viola odorata. 3. Abnormal 
flowers of SarotJiamnus scoparius. 
Hincks, W.—Specimen of a Flora of Canada. Canad. Journ. 1861, 
p. 276. 
Hoffmann, H.—Ein Yersuch zur Bestimmung des Werthes von 
Species und Yarietat. Bot. Zeit. 1862, p. 1. The author’s 
observations refer chiefly to colour, markings, etc. of the seeds of 
Vhaseolus vulgaris. 
Hgfmeister, W.—Ueber Spannung, Ausflussmenge und Ausfluss- 
geschwindigkeit von Saften lebender Pflanzen. Flora, 1862, p. 97. 
(continued to p. 175). With supplementary tables of measure¬ 
ments (1) of the quantity of sap flowing from a stem cut across 
immediately above the root, in JJrtica , Solanum nigrum , Helian- 
thus , and other plants : (2) of the pressure of the sap under like 
conditions in herbaceous plants: and (3) of the same from cut 
branches and roots of the Vine. M. ITofmeister concludes that 
the bleeding depends upon the pressure which the tension of the 
cell-walls of the parenchym and the endosmotic repletion of the 
cells exercise upon the tissues of the root generally, whereby a 
portion of absorbed fluid is forced into the vessels. 
-Ueber die Mechanik der Beizbewegungen von Pflanzen- 
theilen. Ibid. pp. 497, 513. 
-—- Sur les directions des parties vegetaux determinees par la 
pesanteur. A. Sc. Nat. I Ye. ser. xv. p. 179. 1. Differences in 
the tension of tissues. 2. Elongation of the curving parts during 
incurvation. 3. Mechanism of upward curvature. 4. Intensity 
and independence of upward, and the dependence of downward, 
curvature. 5 Equality in the tension of tissues in those parts of 
the root capable of downward curvature. 6. Mechanism of the 
geocentric curvature of roots. 7. Deviations from the vertical 
direction of stems. 8. Experiments on rotation. 
Holle, G-. v.—Flora von Hannover. Hft. 1. Ferns to Ament- 
aceae. Hannover, 1862. 
