Please to collect all the Shrews, Mice, (field or wood), rats, bats, Squirrels, etc., and put them in a jar in common Rum, not whiskey, brandy or alcohol. All of the latter spirits are sure to injure the subjects. Audubon, who was now "killing two birds with one stone"—collecting subscribers for one work and mammals for another, had found a strong and willing helper in the young naturalist of Carlisle. On December 10 of the same year Baird wrote that he had discovered another Flycatcher, as well as a small Woodpecker, which was apparently new, and had shot a "Bay Lynx or Wild Cat a mile & a quarter from Carlisle; the cat ... was 2½ feet long & weighed 12½ pounds.... It was a source of great regret," said Baird, "that I was not able to meet you in Philadelphia when I was there during the latter part of September. I saw Mr. Chevalier[180] several times, and found him a very agreeable gentleman." Audubon replied to this letter on Christmas Day, as follows: _Audubon to Spencer Fullerton Baird_ NEW YORK, _December 25, 1840_. MY DEAR SIR, On my return yesterday from a tour of a month, I found your kind favor of the 10th inst. at my house. I regret exceedingly that you and I should not have met at Philadelphia, as I feel sure by the style and contents of your letters to me that you are fond of the study of natural objects, as much as I am. I have no doubt that your journey during the last summer and autumn was a pleasing one to you, as I can well conceive from the fresh recollections of my many rambles. You would oblige me much by sending me (through Mr. Chevelier) the _Muscicapa_ you obtained Oct. 12th, and also the small woodpecker "with the very broad bill". I am anxious to see those birds, and will take especial care of them, and also return them to you, free of all expense. I cannot at this moment return to the specimens you have already sent me, but in my next letter, I will assure you of the names of the subjects. I wish I could see your Bay Lynx, as I feel somewhat confident that we have more than two species within our limits. Your anecdote connected with the sagacity of the Weasel is quite pleasing to me, and will appear in my biographies of quadrupeds bye and bye. I cannot, as yet, give you any estimate of my work on the Quadrupeds of our Country but will do so as soon as possible. With my best wishes, for your health and prosperity, I pray you to consider me as your friend and obt. servant, JOHN J. AUDUBON. In the following letter by William Yarrell,[181] English naturalist and sportsman, are interesting references to Audubon's smaller edition of _The Birds of America_ as well as to the writer's _History of British Birds_, which later became the standard work on the ornithology of Great Britain: _William Yarrell to Audubon_