358 
L. geographic.*. : — Tichothecium stigma ; T. pyg- 
mcRum. 
L. albo-atra : — Microthelia rimosicola ; Arthonia 
punctella. 
L. excentrica : — Verrucaria allogena ; V. endococ- 
coidea ; V. advenula. 
L. petrjea : — Microthelia rimosicola ; Celidium fur- 
furaceum ; Verrucaria endococcoidea. 
Isidium corallinum, Ach. : — Arthonia various ; A. 
punctella; Acolium corallinum. 
On the other hand, it will be observed that — 
IV. The same parasite frequently affects a considerable 
number of Lichens of different genera. 
And this is a fact likely to be more firmly established in 
proportion as our knowledge of the Micro- parasites on Lichens 
becomes extended and improved. The best illustrations of 
frequent occurrence on the thallus of different genera are to 
be found in the following parasites : — 
Tichothecium pygmceum ; T. gemmiferum. 
Abrothallus Smithii; A. oxysporus. 
Sphinctrina turbinata. 
Arthonia various. 
Celidium Stictarum. 
Buellia urceolata. 
Lecidea parasitica. 
On some Technical Applications of the Spectrum Micro- 
scope. By H. C. Sorbv, F.R.S., &c. 
Contents : — Introduction, p. 358 — On the Colouring Matters of Wines, 
p. 360 — On t he Aire of Dark Wines, p. 363 — On White Wines, p. 367 — 
Adulterations of Wine, p. 368 — On the Colouring Matters in Malt 
Liquors, p. 370 — Adulterations of Malt Liquors, p. 373 — Adulterations 
of Mustard, p. 377 — Adulterations of Rhubarb, p. 378 — Adulierations 
of Cheese, p. 379 — Adulterations of Butter, p. 380 — Adulterations of 
Saffron, 381 — Adulterations of Aloes, p. 382— Adulterations by means 
of Cochineal and Magenta, p. 382. 
My object in publishing the following paper is to show 
that the spectrum microscope may be applied with advantage 
in several departments of technical inquiry, and more espe- 
cially to describe the methods useful in such investigations. 
Since these will be much more readily understood by means 
of practical illustrations, I shall not make many general 
