LETTER 7. 19 ocToBER 1674 219 
In the bile of two calves I find, furthermore, some very 
little globules floating, and very many irregular particles 
of divers forms; among others, some like little floating 
clouds, all consisting of very little globules joined together. 
On seeing these irregular congealed particles, I judged 
them to be joined or stuck together through no other 
cause than because the bile had got cold, and was without 
motion. In the bile of a third calf there wére a few oval 
corpuscles. 
Moreover, in the bile of sucking lambs I find there are 
very little globules, and some, though very few, bright 
particles, which are a bit bigger; besides irregular particles, 
of divers figures, and also composed of globules clumped 
together. 
The bile of a yearling sheep I find to be like that of 
sucking lambs, only with this difference, that in this bile 
there are also oval corpuscles of the bigness and figure of 
those that I remarked in ox-bile. 
I have examined the bile of two young rabbits: that of 
the first was inclined to a purple colour, and in it I beheld 
very many globules, and irregular particles made up of 
globules clumped together, which were of various red 
colours:* and this diversity of colour I imagined to be 
due to no other cause than that some of these compound 
particles, being made up of more globules, were denser 
than the rest. In the other bile the irregular particles 
were fewer, but there were more globules and the colour 
was a light reddish. 
Further, I examined the bile from three old rabbits. 
The first had a very few small globules, but very many 
oval corpuscles of a figure like those that, as I have said, 
I saw in the bile of a cow. In the bile of the two other 
rabbits there was nought but globules, and irregular 
* Evidently red blood-corpuscles. LL. had described these—from his 
own blood—in another letter written earlier in the same year (Letter 3, 
7 April 1674). An English abstract of this appeared in Phil. Trans. (1674), 
Nol. EX. No. 102. pn. 23: 
