He says:
"That Thomas Cooper ... repeated this experiment, and succeeded, I think, after several attempts, in procuring the metal. Dr. John Redman Coxe and myself also performed it, but in our attempt we failed. The professor, however, persevered, and finally procured it.... My brother, Dr. Edward Cutbush, succeeded in procuring it by using the heat of a black-smith's forge. I have not heard of any other attempts in this country except by a gentleman in New York, who was also successful."
These statements substantiate the idea that Woodhouse isolated the metal potassium quite independently from any European chemist; it even looks as if he may have isolated it in the manner referred to before Sir Humphrey Davy had separated it with the aid of the electric current.
In the first volume of the Philosophy there is a frontispiece, a lamp furnace, consisting of a brass rod, fastened to a piece of metal, furnished with rings of different diameters, and thumb screws to raise or lower the lamp and rings when in use. By this furnace evaporation, digestion, solution, sublimation, distillation and other processes, which require a low temperature, may be performed.
And in the second volume there is a frontispiece representing a portable universal furnace, made of strong wrought iron plates and lined with bricks bedded in fire-proof loam. The height of the furnace is two feet. The body of the furnace is elliptical. There are three openings in front of the furnace, one above the other, furnished with sliding doors, and fitted with stoppers made of crucible ware.
Both pieces of apparatus represent a marked advancement. They were evidently exceedingly useful. By their means it was possible to execute excellent work.
It would repay one to examine with care the various American text-books on chemistry, beginning about 1770 and continuing down to 1830. There would arise a picture before one's mind of the successive steps in the development of chemical apparatus, and again, the knowledge derived from the presentation of chemical theory and data would be refreshing and inspirational. It is to be hoped that the time is not far distant when some library, public or university library, will go to the trouble of gathering the American texts on Chemistry for the period just alluded to. It is not likely that an alcove filled with this literature would be largely patronized, yet it would be possible for the enthusiast on the development of chemistry in this country to collect from such a source a great deal of valuable material which might be presented with profit to the rising generation of American chemists.
Cutbush had little leisure during the year 1813, as he was engaged with the duties of the College and was conducting popular lectures on an extended scale. It was necessary for him to invite his friend, Dr. George F. Lehman, to assist in the various demonstrations. They emphasized not only the theory but the practice of chemistry with its application to the useful arts. Their experiments were numerous and were of such a character as to appeal to the general public. The course offered by Professor Cutbush and Dr. Lehman was remunerative. It is said the cost of tickets for ladies was $5.00 and those for gentlemen $8.00.
In addition to the devotion of Cutbush to these didactic courses in chemistry, he spent much time in a literary way. One of the best-known publishers of the city announced the purpose of printing the American Artist's Manual under the editorship of Cutbush. The advertisement stated—
"To manufacturers, however, who are presumed to be interested in practical knowledge the value of such works is greatly diminished by the multiplicity of theories, technical terms and complicated processes which they in general contain. It is, therefore, unnecessary to expatiate on the advantages to be derived from such a publication as is now proposed in the present work. While it is intended to embrace most of the Arts and Manufactures, particular attention will be paid to those of agriculture, brewing, bleaching, dyeing in its various branches, the manufacture of glass, pottery and all others which the situation of our country renders obviously of primary concern and importance."