I 



BOTANY IN GLASGOW UNIVERSITY IN 18tH CENTUKY. 133 



Lecture S. — Vessels of the bark. Sap vessels. Proper vessels. 

 Wood. Fibres of wood. Distribution similarly to those of bark. 

 Lecture 9. — Vessels of wood. Sap and proper vessels. Air 

 vessels. Pith. Similarity to arenchyma. 



Lecture 10. — Trunks. Origin from the seed. Increase. 

 Causes of its growth. Structure — in animals — in biennials — in 

 perennials. The last the proper example of the parts — bark, 

 wood, and pith. 



Lecture 11. — Bark — into cuticle. Parenchyma or cellular sub- 

 stance. True bark. Structure of cuticle. Structure of cellular 

 substance. 



Lecture 12. — Structure of the true bark. Vessels. Sap vessels. 

 Proper vessels. Wood in different plants. 



Lecture IS. — Structure of the wood. Vessels of wood. Air 

 vessels. Structure of the pith. An examination of Linnaeus' 

 and Sir John Hill's theories. 



Lecture H. — On the growth of plants. 1st, growth in breadth. 



^Theories with regard to this. Experiments to prove that the 



rood is formed from the inner bark. 



Lecture 15. — Growth of bark. 2nd, growth in length. An 



[attempt to explain how this is produced. Layers of the wood. 



IProduction of branches. Some observations on engrafting. 



Lecture IG. — Structure of leaves. Budding. Cuticle. Vessels. 

 [Fibres. Cellular substance. Colour and its causes. 



Lecture 17. — -An examination of the effects plants produce on 

 the air. Of the power they have of making the air pure. An 

 lattempt to prove that this arises from the air being taken into 

 [the sap vessels for the nourishment of the plant, where, the 

 [noxious parts being left, the air is thrown out pure. That it is 

 jnly particular kinds of noxious air that can' be thus rendered 

 pure. That this is similar to the water taken in by the root 

 [impregnated with the nourishment of the plant. 



Lecture IS.— An examination of the power plants have in 

 [fouling the air ; an attempt to prove that this arises from the 

 [air being taken into the air vessels ; that this is similar to the 

 [breathing in animals; that the same effects follow; that the 

 [heat of plants arises from this as in animals. 



Lecture i9.— Some effects of the leaves. Perspiration. Secre- 

 [tion. Absorption of light drawing nourishment to the part of 



B 



