Analysis of the Chalybeate Spring at Thetford. 359 
action of nitric acid ; affording also by distillation ammonia, em- 
pyreumatic oil, &c. This gentleman proposes to give it the name 
of ‘*thermo-zoophite.” On mentioning this circumstance cand 
describing the phenomenon afterwards to that eminent botanist 
Dr. Joakim F. Schotw, (the intimate friend of the late Dr. 
Smith of Christiana, who perished in the unfortuate expedition 
to the Niger,) he told me that it was his opinion it might be the 
oscillatoria thermale discovered by Adanson in some of the 
thermz of France, and that he had himself noticed a substance 
somewhat similar above the thermal springs of San Filippo near 
to Acquapendente. This strange substance, he added, contains 
transverse striz, which present under the lens an oscillatory 
movement; and hence the name. 
I may add to this, that Dr. S. said he had discovered in the 
crater of Mount Etna in a sulphury vapour, at a temperature of 
40° Reaumur (90° Fahr.), two plants, one an alga, the other a 
hypnum. The first seemed a plant in its simplest form, consisting 
of globules which appeared still transparent under the lens. 
I shall in a future number of the Philosophical Magazine con- 
tinue my observations on aphlogistic phenomena; meantime I 
only add, that I could not obtain the effect with artificial cam- 
phor (obtained by passing a current of muriatic gas through 
spirits of turpentine). A su/phur match does not ignite on con- 
tact with the platinum aphlogistic lamp, but instantly at that of 
silver; indeed in the first instance it is necessary to attach a 
small piece of amadou to the match. This is curious,—A body 
exists in such a state of combustion as not to ignite a particular 
substance, yet imparting to an intermediate one a degree of igni- 
tion capable of producing the effect. ‘The matches prepared with 
oxymuriate of potassa kindle at either of these lamps. I suc- 
ceeded most readily with the copper wire when J dissolved a little 
camphor in the alcohol. I have the honour to he, Sir, 
Your most humble servant, 
J. Murray. 
P.S. By a typographical error the word surprise in my last 
memoir is made to substitute scepticism. J. M. 
LXI. Analysis of the Chalybeate Spring at Thetford. By 
Mr. Freprick Accum. 
Situation of the Spring. 
Tax water rises in a verdant meadow, situate at the east end 
of the town, in the Suffolk part of Thetford, near the paper-mills 
of Messrs. Munn. 
The situation of this spring appears to be in one of those choice 
Z4 spots 
P 
