142 Kleinere Mitteilungen. 
convey nothing more than empty, vague terminology. On the other hand 
“correlation”, exclusively comprehended as the expression of one and 
the same gene, signifies nothing more nor less than one of the most 
brilliant elucidations of modern research in the science of heredity; and 
consequently this concept has a profound and sharply defined significance. 
How much has this word “correlation‘‘ not been laboure dat! Letus surely 
be glad to have acquired a clear insight into such an, in former times 
enigmatical proposition; for the like matters do not happen every day. 
Letus-keep this idea clearly; we shall not corrupt it by the adoption into 
it of elements which have absolutely nothing to do with it. 
But, retournons a nos moutons: in our table there is only one possi- 
bility of explaining these matters satisfactorily. We remark how there is 
a frequency curve in each column, both, vertically and horizontically; how 
indeed the whole table represents a frequency curve; notice how, next to 
the numerous combinations of some measurements, the scarcity and absence 
of other combinations contrasts. This all guides us into accepting that the 
different combinations here present, are an expression of a probability cal- 
culation; that the plant disposes in such a manner of a specified quantity 
of breadth qualities, and independantly of that, of a specified quan- 
tity of length-qualities and that all these combinations move in unison 
according to the laws of probability. The fact may well be presented to 
our notice that the table does not afford all the combinations that 
might be looked for; that in our table the right-hand upper half and the 
left-hand lower half have been left blank; but, when the above demon- 
stration has carried with it a certain mass of conviction, then perhaps, in 
demonstration of the last fact, we should have had recourse to the pheno- 
mena of coupling and repulsion of qualities, by which, indeed, some 
of the combinations cannot occur and others on the other hand more than 
might be expected. 
In every instance, throughout this paragraph I have endeavoured to 
demonstrate (refer to the beginning of the paragraph), that length and 
breadth are two separate and independant qualities; and consequently that 
every leaf-formation is no expression of any single quality, but originates 
from the cooperation of two separate qualities. 
§ 3. 
With the discussion of the tables in the preceding paragraphs I have 
already alluded, in passing, to the existence of more length and breadth 
qualities. This phenomenon has lately been substantiated by several 
investigators, and this still on the basis of hybrids-breaking up. My 
researches in Coffea have led to analogous results which I shall communi- 
cate in this paragraph, especially, because the results are to be found along 
statistical way. 
