T.H. Huxley had periods of depression at the end of 1871, alleviated by a cruise to Egypt. And again in 1873, this time coincident with expensive building work on his house. His friends were really alarmed, and his doctor ordered three months rest. Darwin picked up his pen, and with Tyndall's help raised £2,100 for him — an enormous sum. The money was partly to pay for his recuperation, and partly to pay his bills. Huxley set out in July with Hooker to the Auvergne, and his wife and son Leonard joined him in Cologne, while the younger children stayed at Down House in Emma Darwin's care.