... Our journey of ten and a half weeks, with Hooker, was a most enjoyable one, every way prosperous, but laborious. Colorado to the borders of New Mexico, a little of Utah and the Wahsatch mountains, and extensive traveling in California, as far south as Monterey, and north to Mt. Shasta. On return, I had Hooker’s copious collections to name up. I made only small and special collections, and most busy we were kept till, on the 6th inst., I put Hooker on the steamer, which, as telegraph tells us, only yesterday reached Queenstown, so he will be landing at Liverpool to-day,--a full fortnight from Boston to London. I am now busy enough with bringing up arrears of correspondence and affairs, and studying some collections which will not wait. Only by the end of this month shall I get to resume my regular, but long, interrupted work. Mrs. Gray accompanied us, and enjoyed it much, enduring well the occasional camp life and such hardship as there was. You should come over, and we will repeat the journey, but only three years hence. Much as I should enjoy it, I cannot spare the time sooner. I found myself quite equal to younger people in mountain climbing.... TO GEORGE ENGELMANN. CAMBRIDGE, July 4, 1877. DEAR OLD E.,--Never mind if you are seventy; Hooker is sixty, and I am between, and we are lively yet. Perhaps we young fellows may knock about rather faster than you like, wanting to do much in a little time. But then, you need not do so much in Colorado as we; take the easy part.... I shall be sorry if you fail us. We must twine in Cuscuta, as we twine in the rest of the book. For real accuracy we must finally come to the terms I propose, entropic and antitropic. We can’t get watch-hands into a good form for the description of order, genus, etc. Be sure I’ll keep you posted. Should like to go to Iron Mountain. WAITING ON RAILROAD FROM CAÑON CITY TO PUEBLO, July 21, 1877. ... If this flowering Euphorbia is the one you asked for I have made good specimens. The round-leaved one is on the hills, and is not yet out; is not the one, I am sure. We had yesterday a good day (with Brandegee)[101] at the Arkansas Cañon; it is grand, surely. To-day Hooker and the Stracheys drive across and down Wet Mountain Valley to La Veta (two long days), while we, Mrs. Gray, Dr. Hayden, and I, return by railroad to Pueblo, and thence to La Veta, by sunset to-day. To-morrow up to a camp on La Veta Pass of Sangre de Christo Mountains, which Captain Stevenson is preparing. Our English friends begin already to feel in a hurry, and for a wonder I am the hold-back member of the party.... SALT LAKE, August 8. I have yours of the 30th July, and I return inclosure. Write hereafter to the Palace Hotel, San Francisco. I trust, and expect, that the strike days are over, and that you will severely punish the ringleaders.[102] Glad you have had nice weather; but you have no air like that of Colorado and Utah....