1^5^ An Attempt to arrange the 



times eggs, potatoes, &c. We had an uncominonly plea- 

 faiit voyasre home, and conftant fine weather, accompanied 

 with northerly breezes. 



' We arrived about the latter end of Augiift fafe in Green- 

 land Dock, after having been out five months. 



Captain Souter kept an excellent table in the cabin, and 

 a conftant fire in the ftove : his ftudy was to make every 

 pcrfon on board comfortable. In the fifteen ^'oyages I have 

 been to fea, I have only twice had the good fortune to fail 

 with men of equal worth ; Mr. Charles Patterfon of the Sea 

 Horfe, and Mr. William Alder, now a Lieutenant in the 

 Britifli Na\y. 



VI. An Attempt to arrange the Cryjlah of Oxidated Tin 

 Cre, according to their fuppofed Structure. Bj Mr. Wil- 

 liam Day, Ijeicejier Place. Coynmunicated by the Author. 



X. HE cryftallifations of oxidated tin ore are defcribcd by 

 Rome de I'lfle, in his Criflallography, to be of the oftaedral 

 form and its modifications ; the oftaedra having ifofceles 

 triangular faces, inclined at an angle of 45° to the bafe of 

 each pyramid; fo that the junilion of their bafes and apices 

 are right angles. In the following arrangement the ocla- 

 edron is confidered as the primitive form, and the modifica- 

 tions as being produced by an accumulaiion, on its faces, of 

 laminie compofed of fimilar minute moleculae, experiencing 

 different laws of decrement on their fides or angles, or on 

 both . Thefe laws of decrement are marked with the figns in- 

 vented by Hauy, of which an account has been given in the 

 Phil. Mag. Vol. II. p. 398. The greater part of thefe forms 

 liaving been very accurately defcribed by De I'llle, all that is 

 now attempted is an application of Hauy's fyftem to the ar- 

 rano^cment of this part of a private cabinet of Englifh mine- 

 rals ; nor would it have been made public but for the re- 

 peated folicitations of fevcrai friends. 



In 



