Proceedings of the Royal Institution. 285 
Light and Heat on Vegetables. Remarks on the Germination of 
Seeds, with the progress of the Corculum or Embryo. Use of the 
Cotyledons. 
Lecture III. Wednesday, June 9. 
Examples of Ascidia, or hollow-foliaceous Appendages. Re- 
marks on the various kinds of Stems, e. g., the Scape, Peduncle, 
Culm, &c. Tilustrations of the Linnean System. 
Lecture IV. Wednesday, June 16. 
Further Examples of the Artificial System. Remarks on the Na- 
tural Arrangement of Plants. Conclusion of the Course. 
SYLLABus oF Mr. WaLKER’s LECTURES ON PLANE GEOMETRY. 
ge The numeral references are to the Propositions in the 
Elements of Euclid. 
Preliminary Remarks and Definitions. 
Lecture I. §i. Monday, May 10. 
Elementary Doctrine of Angles. / 
Prop. 13, 14, 15, El. Remarks. on the Doctrine of Parallels. 
Prop. 29, 28, 27, El. Corresponding subtenses of Angles a test of 
their equality or inequality. Prop. 4, (first part) 24, 25, El. 
Lecture IT. § ii. Monday, May 17. 
Elementary Doctrine of Triangles. 
Prop. 32, El. and Corollaries. Three cases of identical Triangles. 
Prop. 4, 8, 26, El. Prop. 5,6, 18,:19, El. Prop. 20, El. . The 
line drawn from the right angle of a right-angled triangle to the middle 
point of the hypotenuse is equal to half the hypotenuse. 
Lecture II. §iii. Monday, May 24. 
Elementary Doctrine of Parallelograms. 
Prop. 33, 34, 35, 36, 37, 38, 39, 40, 41, El. Converse of Prop. 
34. Prop. 43, El. A parailelogram is bisected by any line drawn 
through the middle point of its diagonal. Prop. 2, 3, 4, 7, El. b, il. 
Lecture IV. §iv. Monday, May 31. 
Doctrine of ‘Triangles, continued. 
Vox, XVII. ».4 
