
          Perhaps you may remember a person calling upon you to enquire
 after feldspar that I saw in your office fro the making of
 Porcelain. When I returned to Middletown I find the
 man had arrived before me and had examined the material
 in Situ. he assured me he found the Feldspar purer
 and more abundant than any he had met with, his remark
 to me was he had found it all and more than I had
 represented to him. last fall he offered for the article
 $5 brought to the river side or $7 delivered in N [New] York.
 they are now selling it by contracts the price agreed upon
 I have not been informed. This being an important part
 in the arts I deem it worth making known to you.


 Blood for some time I have been desirous to know the best means
 of analysis. I was aided by an excellent paper in Sillimans
 Journal no [number] 48 p [page] 384. The use of Black oxyde [oxide] of
 Copper was there new to me, and the air pump experiments
 want to obtain further information not having any thing
 within my reach that goes quite as far but the
 original papers have not seen. have you it that
 I can see sometime?


 You may remember we had some talk about the difference
 between solar and terrestrial heats. have you turned to that
 curious article to found in Silliman Journal no [number] 48 p [page] 383


 Glaten and [Album?]. I have found nothing very satisfactory
 respecting the former. of the latter I have collected a number 
 of curious facts in a paper I have drawn up and should
 like to submit it to your perusal sometime.
        