CONTEXTS. Vll 



ARTICLE PAGE 



XXrV. — On the Addition and Multiplication of Logical Relatives. 

 By Joseph Joii.v Murphy, F.G.S. Commumicated by the 

 Rev. Egbert H-^RLE?, F.R.S ^oi 



XXY. — On the Growth and Use of a Symbolical Language. By 

 Iluan M'CoLL, Esq., B.A. Communicated by the Rev. 

 Robert Harley, F.R.S , 225 



XXYI. — On a Chemical Investigation of Japanese Laquol-, orUrushi. 

 By Mr. Sadamu Ishimatsu, late of Tokio University. 

 Commuuicu ted by Professor Roscoe, Pn.D., F.R.S 249 



ERRATA. 



Vol. VI. 



Page line 



^621. 3> f^''' 3'2 ^ta«f 2*2. 

 264, 2, for 15 read 50. 



Vol. VII. 



41, 20, for 5955 read 5935. 



— , 31, for 6000, imder C, read 6014. 



32, before theoretical quantity insert nearly. 



43, 23, for 6682 read 6651. 



46, 20, for \-j- spread <). 



22. for 5*2 read 5'i. 



26, for latter read former, and for former read latter. 



27. f^ 1600 (i7+a?)::=24ooX2i'2 rrac? i6oo(2i'2 4-^) = 240ox 17. 

 5, for 2a(c read Sa/;'' 

 1 8, for Q< = QV read qt = qjt' 



