V O L U M E 8 , D O C U M E N T S 1 4 4 a , 1 5 4 a , 1 5 9 a 1 9
Vol. 8, 144a. To Heinrich Zangger
[Berlin, 15 November 1915]
Dear friend Zangger,
I thank you heartily for the detailed news. I was silent because I have been la-
boring inhumanly, but also with magnificent
success.[1]
I modified the theory of
gravitation, having realized that my earlier proofs had a gap. Now the thing has be-
come very simple and easy to
understand.[2]
I have now derived from the theory the
hitherto unexplained anomalies of planetary
motion.[3]
Imagine my joy! I shall be
glad to come to Switzerland at the turn of the year in order to see my dear boy. I am
writing him at the same
time.[4]
I am gratefully obliged to you more than I can say
for your conciliatory mediation.
Warmest greetings from your
Einstein.
My wife wrote me recently about the children in a manner that appears genuine. I
am going to try to arrange my meeting with my Albert directly with
her.[5]
Vol. 8, 154a. From Hans Albert Einstein
[before 30 November
1915][1]
Dear Papa,
I’d like to answer you
now:[2]
I will come over New Year’s, i.e., from the 31st to
2nd; I’m thinking of going on the
Zugerberg.[3]
I don’t want to stay longer because
Christmas is nicest at home. Besides, I got skis and would like to learn how to use
them with my colleagues.
The ski equipment costs about 70 francs, and
Mama[4]
bought them for me on
condition that you also contribute. I consider them a Chrismas present.
I’m also thinking of taking the skis along to the Zugerberg, in case it has snow.
Yours,
Adn.
Vol. 8, 159a. To Heinrich Zangger
[Berlin, before 4 December 1915]
Dear friend Zangger,
Just now I received the enclosed letter from my Albert, which upset me very
much.[1]
After this, it’s better if I don’t take the long trip at all rather than