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Rh hit the high places along the way. It was a beautiful, clear morning and we had a magnificent view of the country as our trail led along the summits of the mountains for some distance. We could see one hundred miles in any direction, with Mexico on one side of us and the United States on the other. Mountain ranges seventy five miles away did not seem more than twenty-five. After walking for an hour or so re came to my first nest, a Grace's Warbler, together with which I secured a fine set of three slightly incubated eggs and the parent bird. After packing the eggs and the bird we went on until I found a nest of Coues' Flycatcher from which we secured a fine set of four eggs. Next came an Audubon's Warbler's nest which I had found building the week before. It was situated near the end of a long branch in the top of a red fir tree about sixty feet up. While trying to secure this nest I heard an Olive Warbler not far off and soon after I observed a fine male in the branches above my head.

While watching him the female made her appearance and soon after went to her nest which was placed on a large limb of the same tree and not far from the trunk. It was quite a temptation to examine this nest first, but as I had already tied the rope front the limb which held the Audubon's nest to the main trunk above, I thought I had better finish the job, so I crawled out on the limb and with one hand on the rope I reached out for the eggs with the other, but just as my fingers touched the nest the limb broke off short between myself and the trunk and left me hanging by the rope. I lost the set of Audubon's Warbler and came near losing my life with them, but I managed to get back to the trunk of the tree all right and a few minutes later I had forgotten all about it, as I reached out and took the four perfectly fresh Olive Warbler's eggs front the nest above, one by one. I also secured the female and the nest with a large piece of the limb. I know of only one other set, besides those taken by myself, which was taken, I believe, by Mr. Price of Stanford University some years ago and which is now in the Smithsonian Institution.

I found this variety, or rather subspecies, along the San Pedro River, near the Mexican Line and also near Tucson, but had a better chance to observe them along the San Pedro, where I found several nests placed in willow and mesquite trees, generally in upright forks from ten to twenty-five feet up. The nests are very much like those of the Yellow Warbler, likewise the eggs. All the nests I found contained two eggs of the Dwarf Cowbird

Grace's Warbler is equally as rare, if not more so, than the Olive. During three seasons' collecting in the mountains of Southern Arizona I have seen only four or five of these birds, two of which had nests. They are very shy and, like the Olive, keep well up in the pines in the thick foliage, except when they have a nest and then they become quite bold. While walking along the summit of a ridge one morning about the middle of June, I came to a likely looking pine and began to look through it for general results. After stretching my neck for several minutes I spied a single straw protruding front a thick bunch of pine needles. This aroused quite a little suspicion in my mind so laid down my climbers, collecting-box and gun and tried to look into the bunch of needles, looking from all directions, but could not see any other signs of a nest. I could have easily climbed up and made sure, but it was soon after breakfast, and I knew that I would have a great amount of climbing to do later on that day, so I picked up my traps and moved on, but had only gone a short distance when I noticed a Grace's Warbler hopping about in a bush. While I stood watching, it flew to the ground and picked up some fine straws and carried them to the bunch of pine-needles, out of which I had