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121. What is the method by which natural philosophers obtain and apply their knowledge?

122. How may we be certain that this method is correct?

123. What classes of facts are esteemed most highly?

124. Upon what is this principle founded?

125. What does it destroy?

126. How have these laws been discovered?

127. How may we account for much of the strange and heretofore unexplainable phenomena which is constantly taking place?

128. Why is this so?

129. What is the result of this knowledge?

130. How will our best interest be conserved?