T. S. Hunt on the Theory of Types in Chemistry. 268 
Handbook, ascribes the theory. The notion of condensed types, 
and of hydrogen as the primal type, was not so far as [ am 
aware brought forward by either of these, and remained unno- 
ticed until resuscitated by Wurtz in 1855, seven years after I 
had first announced it, and one year after my reclamation pub- 
lished in this Journal in March, 1854. 
y claims have not however been overlooked by Dr. Wolcott 
Gibbs; in an essay on the polyacid bases, he remarks that in a 
paper he had attributed the theory of water types to 
illiamson and Gerhardt, and adds ‘‘in this I find I have not 
T.S 
chemical speculation and research, remembering that my own 
publications on the subject, which cover the whole ground, 
some years earlier than those of Williamson, Gerhardt, Wurta 
or Kolbe. Ss 
Montreal, Canada, Jan. 5, 1861. 
Sudsalts, whic 
bibasic and tribasi 
sustain the . 
rates be . 
line subn pat 
HO (tribasic), and NO,.M,0,.H aie 
Which retain their water of composition at wegres Wea 
sulphuric acid are, Ist, the true monobasic sulphate, - 
ponding to the Nordhausen a drous Dam called 
the one neutral sulphate, ee a 3d, | ree deial ack! 
hates, S.0,.M,0,, corresponding to the crystallized or gia turpetl 
density 1-780 ; 4th, the sulphates, 8,0,-M,0 , represented vi — 
mineral ; and, 5th, the so-called quadribasic sulphate, S30, -Ma SHO at 
copper salt of this type, according to | vo aeahgeg 
sulphates of zinc and 
