[36] See "_Nature_," vol. XXII, page 203. * * * * * Changes made against printed original. Page 11. "our knowledge of the substance": 'knowwledge' in original. Page 24. "Nearly every manufacturer": 'ever' in original. Page 32. "Persons in general can easily understand": 'ean easily' in original. Page 39. "wealthy persons who have devoted themselves": 'themselver' in original. Page 62. "also all terrestrial forces": 'terrestial' in original. Page 81. "better systems of hygiene": 'hygeine' in original. Page 114. "course in which the throng is densest": 'the' repeated across line break in original. Ibid. "thousands of different chemical compounds": 'compouuds' in original. Page 116. "emits and absorbs": 'aborbs' in original. Page 119. "In every genuine volition": 'volitition' in original. Page 126. "purely physical and chemical conditions.": 'physicial' in original. Page 127. "the judicial detection of truth": 'judical' in original. Ibid. "completely converted into acquired tendencies": 'completly ... tendences' in original. Page 134. "the present state of civilization": 'civilzation' in original. Ibid. "to withhold truth from ignorant patients": 'withold' in original. Ibid. "lists of our moral deficiencies": 'deficiences' in original. Page 135. "there exist no royal roads to happiness": 'their exist' in original. Page 151. "a diminution of waste": 'dimunition' in original. Page 152. "twenty millions of pounds annually": 'anually' in original. Ibid. "Photography is also largely used in our gaols": 'in our goals' in original. Page 158. "acting under the same conditions": 'conitions' in original. Ibid. "every phenomenon requires time": 'requiries' in original. Page 182. "to be carried out effectually": 'effectualy' in original. Page 184. "been driven out of science altogether": 'althogether' in original. Page 186. "more or less fortuitous circumstances": 'fortuitious' in original. Page 189. "their labours should be remunerated by the State.": 'remuerated' in original. Page 199. "should not be similarly remunerated": 'similarily' in original. Page 203. "consist essentially of a continued series of repetitions": 'esssentially' in original. Page 217. "of local value to that society": 'of' repeated across line break in original.