114 TRANSACTIONS OF ROYAL SCOTTISH ARBORICULTURAL SOCIETY. 
X. Notes on the Physiology and Structure of Trees and Shrubs 
as shown by the Microscope ; along with a Cabinet containing 
100 Photo-Micrographic Slides illustrative of Plant Physio- 
logy specially relating to Timber. By D. F. Mackenziz, 
Factor, Mortonhall, Midlothian. 
The micrographic slides! which accompany this paper, having — 
been photographed direct from the actual tissue of the plants, 
are far superior for lecture and lantern purposes to natural-wood 
sections mounted in any medium. The natural-wood sections 
require a high-power micro-front lens in the lantern, while these 
slides give much better results with the ordinary form of lantern 
lens. They are also much cleaner to handle than sections 
mounted in Canada balsam or other media, and are noé liable to 
damage through damp or heat. 
The slides being bound in metal, and closely fastened with cement, 
are dust and damp proof, and are, in every way, well suited for 
lectures having for their object the identification of woods, as 
well as the illustration of the physiology of trees and shrubs. 
The following is a list of the slides, and, except where otherwise 
stated, they are all photos of transverse sections :— 
Willow, Salix daphnoides. 
Honeysuckle, Lonicera semper- 
viTens. 
1. The Upas Tree of Java, Antiaris | 15. 
toxicaria. 16. 
2. Stem of Maize, Zea Mays. 
3. Footstalk of Fern frond, Péeris | 17. Judas Tree, Cercis Siliquastrum. 
serrulata. 18. Pith, wood, and bark of young 
4, Fungus germinating, Podisoma Ash, Fraxinus excelsior. 
juniperina. 19. Two-years’ seedling Elm, Ulmus 
5. Pith, first year’s growth of Black campestris. 
Italian Poplar. 20. First year’s growth, Cluster Pine, 
6. Pith of Vine, Vitis vinifera. Pinus Pinaster. 
7. Pith of Elder, Sambucus nigra. 21. First year’s growth, Norway 
8. First year’s growth of Vine, Vitis Spruce, Abies excelsa. 
vinifera. 22. Long. rad. sect., pitted cells, 
. Pith, wood, and bark, first year, 
Ficus elastica. 
3. Pitted cells, 
Abies excelsa. 
Weymouth Pine, 
10. Evergreen Oak, Quercus Ilex. Pinus Strebus. 
11. False Acacia, Robinia Pseud- | 24. Rad. sect., double rows of pitted 
Acacia. cells, Wellingtonia gigantea. 
12. Laburnum, Cytisus Laburnum. 25. Pitted cells, Thuja ortentalts. 
13. Cherry, Cerasus vulgaris. 26. Pitted, or bordered cells, Arau- 
14. Lace-bark Tree, Lagetia lintearia. caria excelsa. 
1 The slides may be inspected by members of the Society on applying, in 
writing, to the Secretary. 
