APPENDIX. 
Euchd's doctrine of Parallels demonstrated. 
By ALExX’R C. Twinine, LL.D. 
lettered and numbered in a manner to ig eng their proper 
they are thus pre- 
Evuciip’s Evements, Boox L 
Prop. IV. Cor. If two incomplete figures have their sides 
€qual, each to each in the same order, and likewise the con- 
tained angles equal, each to eaeh in the same order, then the 
two sides drawn to complete the figures shall be equal, and the 
figures shall be equal and alike in every respect. 
* By T. Perronet Thompson, Queen’s Col., Cambridge. 
