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Show Tun Spots Over Douh Ivy oh. These siots are believed ta afford an examplo of protective markings pcr- petuatcd by natural selection. They seem to have lx-en acquired at a cooi- , paratlvcly reeont jn'riod, when the dog had become semi-domesticated. Th.' original dog was red, and did not po-j-oss thew pot. When he slept hf h'd himself from possible enemies, but thia ; thefeeml-domostieated dog could not always al-ways do. Now, when the color changed by domestication und selected breeding, breed-ing, and dogs became pied and black, thoo which had epot over their eyv would look, when aidecp, as though , thoir ?yej were open and still on the watch. Therefore, their enemies would be deceived, ami they would be lens liable lia-ble to be killed during bleep than dogs which had not such pots. Thus ihey Mimvud, and transmitted their peculiarity pecul-iarity to Uiolr olTsj-rljigr. Tlieso pots arc supposed to be the most, If not tho only, permanent markings' on dogs. f-'nn FranujicQ Chronicle. 1 |