NOTICES OF BOOKS. 55 
. pendence of the different layers of wood, and connexion of each 
with the Roots. Vessels alone convey the elaborated Sap. Open- 
ings of communication in Spiral Vessels. Method of demon- 
strating Spiral Vessels in Leaves and Petals. Arrangement of 
Spiral Vessels. Vascular connexion of the Petioles of Leaves with 
the Stem. Formation of Ducts and Spiral Vessels from Cells. 
Longitudinal marking of Ducts and Spiral Vessels. Changes 
effected during the transformation of Cells. Breaking up of Cells. 
Inference as to the functions of Vessels. Passage of elaborated 
Sap along the Vessels of the Petiole, &c. Mechanical action of 
the Spiral Vessels. Deductions from experiments regarding the 
office of the Leaves, &c. First direction of the Elaborated Sap ; 
its ascent. Cause of Death by Ligature. Escape of Fluid from 
Trees wounded during spring, and its cessation. Dutrochet’s 
explanation of the cause why Sap ascends. Analogy of Starch in 
Plants to Fat in Animals. Nutrition of Plants, and passages by 
which the nutritious matter is conducted; with experiments and 
observations. Disappearance of Starch in Vegetables. Analogy . — 
to Animal Nutrition. Wood of Conifere. Cause of Endosmose 
and Exosmose, and characteristic properties of each. Cause of 
Accumulation. Explanation applicable to Fluids, possessing dif- 
ferent chemical properties. Endosmose and Exosmose referable 
to Attraction. i 
The plates, two in number, are well executed, and the descrip- — 
tive matter clearly expressed, and evidently the composition of a 
Naturalist anxious to make accurate investigations. The * Inquiry" 
cannot fail to be considered an important addition to Parola 
Botany, a study yet in its infancy. 
Hepatica Brirannicæ ; or Pocket Herbarium of British Hepa- 
tice, named and arranged according to the most improved pions 
by Witt1am Granam M’ Ivor, Royal Gardens, Kew. ud 
On more than one occasion, in the volumes of our Journal, 
we have borne prion to » usefulness. * mia and 
