I wonder how you are getting along this winter as I have heard nothing from or about you since the Madison meeting of GSA. Sardeson sent me a letter with a good account of the Pleistocene papers, and I heard from Schuchert about the meeting when he visited on his way to CA. Fairchild was here before the holidays and Keyes was here at the time of the Madison meeting; I wonder why he did not attend. Davis came Feb. 1st to give lectures on physiography and will be here for the entire second semester. I attended three of the lectures, but I got chilled at the last one because the windows were all open and I did not wear my overcoat. The next day, Feb. 8th, I went to bed with bronchial pneumonia and stayed there for 2 weeks. I then began sitting up a little, and by the first of March I was able to be up and dressed most of the day. I lost about 12 pounds and weighed only 130 when I first got out about March 1st. I am lighter now than I have ever been since I first got my growth. I now weigh only 132. It will probably take a month or more to get back to my normal weight of 140-145 lbs. But I have a good appetite and my strength is coming back faster than my wieght. We have had a spell of exceptionally cold weather here for the last 3 days for this time of year. On March 10th, it rained over an inch here and there is more snow in the mountains than I have seen before. The Santa Catalina and Santa Rita mountains are both in plain view here with points up to 9000'. The altitude here in Tucson is 2400' Yesterday I read Chamberlin's paper on Elastacy in the Journal of Geology. It strikes me as excellent; he told me its main ideas when I saw him in Chicago on my way here, but I did not get the full force of its meaning. Under this interpretation, there seems to be no place for Wegener's floating continents. The continents are entirely too stable. I will be interested in hearing how Chamberlin's paper strikes you. We plan to return to MI about April 20, and I may then go to Philadelphia for the American Philosophical Society meeting on April 27-30. I am thinking of presenting a paper there on drainage changes in the Ohio River basin with dates of changes. I can now discriminate between changes dating from the Illinoian stage and earlier ones due to glaciation and others still earlier that were affected by stream capture. It now appears that the divide on the Ohio River at the first glacial stage was near the N end of the WV Panhandle just W of Smiths Ferry in PA. There seems to have been only a slight trenching of the col then, after the ice sheet retreated, the drainage returned northward. Most of the trenching of this col seems to have been since Illinoian glaciation. I now regard the pre-Wisconsin drift in NW PA as mainly Illinoian age, and also the main ligh-level gravels in the Allegheny, and the Ohio and the lower course of the Beaver River. Before last year's studies i considered them to be Kansan or perhaps Jerseyan. Mrs L & I celebrated our 120th birthday on March 10 very quietly at home. We were going to have a spread at a downtown restaurant but the rain kept us in. My sister is with us; she came to get rid of a bronchial cough that has bothered her for so many years, just as mine has bothered me. She is seeing a slight change for the better but much less than she had hoped for. My cousin Mrs. Dewing, who had been an invalid in our house for over 11 years, died January 13. She was being taken care of, in our absence, by Mrs. Dibble and Mrs L's sister. It is a relief to feel that she is through her troubles. She was very uncomfortable for the last 3 months and not able to sit up. A paralytic stroke caused her death.