Theory of mixed Gases. iga 



improved breeeds in the hands of persons most likely to 

 preserve, and further to improve them. 

 August j 7, 1S03. Joseph Banks, 



POSTSCRIPT. 



As the publication of this report has been delayed by un- 

 avoidable circumstances to so late a period, it is proper to 

 add, that the wools of 1803 have yielded, both raw and 

 scowered, much as usual. The prime, or R., of the ewe 

 flock were sold for 6s. od. a pound, and that of the rams for 

 6s. 6d. These enormous prices, however, depended on a 

 scarcity of imported Spanish wool, and are highly distress- 

 ing to the manufacturer : they ought not, therefore, to be 

 allowed to enter into the speculation of the grower. 



The sheep that can be spared from the roval flock will 

 be sold by auction this year at a barn opposite the Pagoda 

 in Kew-lane, on the 15th of August next. Notice of the 

 particulars will be given as soon as possible. 



July 10, 1804. 



XXXIII. Illustration of Mr.D Alton's Theory of the Con- 

 stitttftoh of mixed Gases. By Mr. William Henry 

 of Manchester*. 



To Mr. Dalton. 



DEAR SIR, 



JLn the first enunciation of a new theory, it is not unusual 

 that some links are omitted in the chain of reasoning which 

 led to its formation; and thus the doctrine fails of that 

 ready and general acceptance which immediately follows 

 its more distinct developement. Such an omission appears 

 to me to have taken place in your theory of the constitu- 

 tion of mixed eases ; for, according to your own candid con- 

 fession, several persons, versed both in chemical and me- 

 chanical science, have declared their inability fully to under- 

 stand the scope of the hypothesis, and consequently to 

 judge of its merits or defects. In the discussions, also, 

 which took place in this society, on your several papers, 



f "The editor has been furnished with a copy of this letter (which was 

 rdad before the Manchester Society) as a sequel to the various interesting 

 communications from Mr. Dalton on the same subject which have ap- 

 peared in the Philosophical Magazine. It may be proper to itatc, in 

 apology for the repetition of a few circumstances already advanced in Mr. 

 Dalton's letter, published in our last number, that the author had not 

 seen the letter alluded to at the time when these illustrations were 

 written." 



the 



