S. W. Johnson on Native Crystallized Terpin. 201 
was at once suspected they might be identical with crystallized 
terpin. Their faint resinous taste and odor, not to be distin- 
guished from that of the artificial substance, confirmed this view. 
o obtain full information regarding the crystallometrical 
characters of the substance, I applied to my friend, Mr. John 
ake of New Haven, to make a comparison between the native 
crystals and those of artificial preparation from the chemical cabi- 
net of the Sheffield Scientific School. Some of the highly inter- 
esting results of these investigations are communicated by Mr. 
Blake in the paper that follows, and leave no doubt of the iden- 
tity of the two substances, although their crystals are not devel- 
oped in the same manner, and exhibit other physical differences 
which, as he states, disappear when both are recrystallized from 
the same solvent.* 
After Mr. Blake had finished his examinations, a combustion 
was made on nearly the whole available substance. The hydro- 
gen determination was lost by the fracture of the CaCl tube, but 
the estimation of carbon fully confirmed the conclusions previ- 
ously arrived at. The combustion was effected in a tube partly 
63°16 per cent. 
The substance is therefore hydrated terpin or crystallized 
turpentine camphor C,,H,,O,+2aq. Per w sa 
lity. 
e formation or this substance in the buried tree presents 
no difficulties, since we know on the authority of Dumas, Deville 
and others, that oil of turpentine in contact with water, combines 
with the latter in absence of acids or other powerful agents of 
chemical change. 
Prof. Brewer, who is familiar with the timber of California, is 
of the opinion that the wood to which the crystals were attache 
is that of a pitch pine, Pinus ponderosa. ; 
This a 's to be the first recorded instance of the occur- 
rence of crystallized terpin, native. 
ovember, 1866. 
* Mr. Blak. ; MR Eo. eT es and 
ta in reserve ome ster valeble observations whi to be hoped be il 
shortly publish—s. w, 3, 
