AMALGAMATIONAL INTENSION. PAB 
The possible combinations of the ten varieties in question, any one 
of which is as likely to occur as is any other, are 1,024, which is equal 
to 2 raised to the roth power; the probability, therefore, that the com- 
bination or set of varieties that succeeds in one district is ;i;, or 1 in 
1,024; while the probability that those that succeed in the one district 
will not be all the same as in the other will be }*3, or 1,023 in 1,024, 
which is more than a thousand times greater than the reverse prob- 
ability. 
These 1,024 different results, any one of which may occur in one 
section, are calculated on the supposition that all the representatives 
of the species in one section that succeed in propagating will in time 
coalesce by intercrossing; as we shall presently see, the number of 
divergences in the two sections may be vastly increased by the diver- 
sity of ways in which the same varieties may be combined through the 
greater or less influence of minor segregations within the bounds of 
each district. 
10. Amalgamational Intension. 
In my paper on ‘‘Divergent Evolution through Cumulative Segre- 
gation,” I have referred to the fact that the vast majority of diver- 
gentforms produced by segregation, after existing for a time, are 
interfused with competing forms of the same species. Now, it is 
evident that when a permanent segregation arises, if in the separate 
sections there is a diversity of amalgamations between the slightly 
divergent forms produced by partial segregations, the results will be 
divergent in these separate sections. That there will be diversity in 
this respect, we may argue, first, from the improbability that all the 
varieties in any one section will occur in each of the other sections; 
Second, from the improbability that if the same varieties occur in each 
section they will occur in the same proportions; and, third, from the 
improbability that if they are the same and in the same proportions, 
they will break over the barriers and breed with each other in 
precisely the same way in each section. Amalgamational intension 
relates only to the last point. The other two points have been dis- 
cussed under the principle that separation always involves more or 
less segregation (see the third paragraph on the first page of this 
paper), and under indiscriminate elimination, which we have just been 
considering. 
Taking up, again, the supposed case considered under eliminational 
intension, if the different kinds of new food were so situated as to 
make it more or less difficult for those feeding on one kind to cross 
with those feeding on other kinds, the representatives of the species in 
each of the completely separated districts would be divided into minor 
