14 Transactions of the en ee 
This paper, it will be noticed, extends over a wide field, and there 
are many points which require further elucidation. With this view 
additional experiments are being made, and I hope shortly to be able 
to go more fully into some of the subjects that are here but lightly 
touched upon. 
EXPLANATION OF PLATE LY. 
Fic. 1.—Cells from egg albumen in sugar solution. 
2.—Cells from gluten in sugar solution. 
3 and 4.—Cells and mycelium from flour and malt albumen in sugar solutions. 
5.—Yeast cells developing in mucilage in barley meal extract. 
6.—Mould, &c., from malt extract in sugar solution. 
7.—Mould from lemon juice in sugar solution. 
8.—Mycelium and cells from pus in sugar solution. 
9.—Exhausted cells from wort ferment. 
10.—Exhausted cells from wine ferment. 
Il.—The Origin of the Colowring Matter in Mr. Sheppard's 
Dichroic Flwd. By EH. Ray Lanxusrer, B.A., F.R.M.LS. 
(Read before the Royau MicroscorrcaL Society, June 8, 1870.) 
Mr. Prestpent,—Since you have lately twice publicly alluded to 
the views I expressed on the above matter in 1867, and have de- 
clared that the recent observations of my friend Mr. Sorby have 
entirely “ disestablished” those views, I beg to forward you these 
few lines relative to the matter, and to assure you that, so far from 
being in the position of the Irish Church, the opinion which I held 
is entirely confirmed by what has since transpired. 
Mr. Sheppard’s paper, published in the ‘Quarterly Journal of 
Microscopical Science, 1867, p. 64, was entitled “On an Example 
of the Production of a Colour possessing remarkable Properties by 
the Action of Monads (or some other microscopic organism) upon 
Organized Substances,” and he distinctly advocates therein (as did 
you also, I believe) the view that the dichroic fluid was due to the 
conversion of albumen artificially added or naturally present by 
the working of some monads or other. He refers to Pasteur’s 
observation of the action of monads in changing the colour of 
certain bodies, and no one can deny for a moment that this was 
his and your view of the origin of the colour. 
It was this method of looking at the matter which I declared 
to be “ unnecessarily conjuring up a mystery,” to which opinion I 
still most strongly adhere, At the same time I acknowledged in 
my note in the ‘ Quarterly Journal of Microscopical Science,’ 1867, 
p. 284, the great interest of Mr. Sheppard’s observations, and I 
am glad to be able again to say that we are indebted to him in 
