Meaning of word "species," [2].

Mechanical theory of spine, [164].

Mediterranean oyster, [88], [98].

Meehan, Mr., [88].

Mexico, dogs in, [99].

Mill, John Stuart, [15], [189], [193], [194].

Mimicry, [8], [29].

Miracle, [287].

Molars, [111].

Mole, [176].