that ten must be annually born to make up the deaths from various causes.
In Paraguay, Azara states that in a herd of 4,000, from 1,000 to 1,300 are
reared; but then, though they do not kill calves, but castrate the young
bulls, no doubt the oxen would be killed earlier than the cows, so that the
herd would contain probably more of the female sex than the herd at
Chillingham. There is not apparently any record whether more young bulls
are killed than cows. I am surprised that Lord Tankerville does not have
an exact record kept of deaths and sexes and births: after a dozen years
it would be an interesting statistical record to the naturalist and
agriculturist.


(PLATE: PROFESSOR HENSLOW.)


LETTER 128. TO J.D. HOOKER.

(128/1. The death of Professor Henslow (who was Sir J.D. Hooker's father-
in-law) occurred on May 16th, 1861.)

Down, May 24th [1861].

Thanks for your two notes. I am glad that the burial is over, and
sincerely sympathise and can most fully understand your feelings at your
loss.

I grieve to think how little I saw of Henslow for many years. With respect
to a biography of Henslow, I cannot help feeling rather doubtful, on the
principle that a biography could not do him justice. His letters were
generally written in a hurry, and I fear he did not keep any journal or