Waldron” (here he beamed and blinked at the lecturer) “will excuse me when I say that they are necessarily both superficial and misleading, since they have to be graded to the comprehension of an ignorant audience.” (Ironical cheering.) “Popular lecturers are in their nature parasitic.” (Angry gesture of protest from Mr. Waldron.) “They exploit for fame or cash the work which has been done by their indigent and unknown brethren. One smallest new fact obtained in the laboratory, one brick built into the temple of science, far outweighs any secondhand exposition which passes an idle hour, but can leave no useful result behind it. I put forward this obvious reflection, not out of any desire to disparage Mr. Waldron in particular, but that you may not lose your sense of proportion and mistake the acolyte for the high priest.” (At this point Mr.