Benjamin Silliman, Jr. Mentions My Lecture On Deep Placer Mining

BENJAMIN SILLIMAN, JR. (1816-1885). Silliman was a Yale chemistry professor and helped develop the petroleum industry.ALS. 1pg. 6 x 8. New Haven. April 24, 1874. An autograph letter signed B Silliman to Mr. A.A. Sparks of New Rochelle, New York: The report of my lecture on deep placer mining to which you referis, I regret to say, very badly printed & especially, the latter half, very imperfect. Suchare the fate of those who speak extemporaneously upon themes beyond the usual experience of photographic reporters who make sorry work with all technical and scientific matters. Placer mining operations extract deposits of valuable minerals, like gold, located at deeper depths. A matching envelope stamped with American Journal of Science accompanies the letter.