from the Coal Measures of Torbane-hill. 
57 
Are there some yellow spots in this light-coloured portion of the 
mineral ? — There are. 
What do you think these yellow spots indicate? — They indicate the 
existence of vegetable cells. 
Have you applied any test to endeavour to find out whether they were 
vegetable or not ? — I have, Sir ; I have many reasons for concluding that 
they are vegetable cells. 
Would you mention your reasons? — I find that they can be perfectly 
isolated — they project upon the edges of all sectioDS of the mineral — they 
are rounded — they are as uniform in size as the cells of other vegetable 
Structures — the general appearance of the section is that of a piece of 
vegetable cellular tissue — the yellow spots do not act upon polarised 
light, or act upon it very feebly. 
Generally speaking, do you consider that the Torbanehill mineral 
exhibits the same appearances of structure and position microscopically 
as the other cannel minerals ? — It does. 
Did you see Dr. Greville's drawings ? — I not only saw the drawings, 
but I saw him make them. 
You had long previously examined the minerals ? — I had ; long and 
carefully. 
Do these drawings appear to you to represent the general character of 
the mineral ? — They do. 
And you believe these drawings to represent cellular tissue ? — I do. 
Your sections were taken at random from the general specimens that 
you had ? — Certainly. 
As fair specimens that you thought the mineral would exhibit ? — 1'hat 
w^as my chief object in obtaining them from the Aberdeen Gas Works. 
I took the specimens for as fair average specimens of the Torbanehill 
mineral as I could obtain: 
And they would have supplied similar representations as those Dr. 
Greville has given, in your opinion ? — I am satisfied of that. 
Cross-examined hy the Dean of Faculty. — You say Dr. Greville's 
drawings represent the same thing that you saw ? — They do. 
Did you examine the ash of this coal ? — Yes. 
With the microscope ? — Yes. I consider the examination of the ash as 
liable to great sources of fallacy, and place no dependence upon it. 
Your reasons.? — I should not look upon the ash to make out the 
structure it contains. 
That is not your reason, but a repetition of your opinion. What is 
your reason ? — Because I would expect the greater portion of vegetable 
structure, if it existed, to be destroyed by the process of combustion. 
Did you ever examine the ash of ordinary coal with the microscope ? — 
I have not. 
Dr. K. K. Greville. — Examined hy Mr. Neaves. 
Dr. Greville, I believe you have devoted a good deal of your attention 
to the study of botany.?^ — Yes, it has been the principal study of my 
whole life. 
And in connexion with that to the use of the microscope ? — I may say, 
without exaggeration, that for many years I have used the microscope 
almost every day. 
Among other branches of the vegetable kingdom, you have studied and 
written upon the cryptogamic family, which includes the ferns ? — Yes. 
And which requires particular use of the microscope in order to illustrate 
its fructification ? — Yes. I may add that I have made the drawings of 
everything I have published from my own microscopical investigations. 
/ 
