Ini^x 



265 



Leibnitz, G. W., 17 

 Leptoplana, behavior of, 167, 



168 

 Leucocytes, behavior of, 189-193 

 LeRoy, G., 17, 19, 22 

 Lewes, G. H<, 132, 123 

 Loeb, J., 31, S3-SS, 69, 77, 78, 



81, 84, 89, 90, 98, 101, 102, 



105, 113, 121, 183 

 Loeb, L., 185 

 Loxophyllum, behavior of, 125, 



169-174 

 Lubbock, Sir J., S3 

 Lyon, B. P., 64 



Malebranche, 16 



Mammals, spx recognition in, 



236, 240 

 Massart, J., 101, 190 

 Mast, 50, 56, 75, 76, 84, 89, 99, 



109-111 

 McGinnis, M. ,0., ,106 

 McGraw, K., 84, 85 

 Michener, E. R., 105, 106 

 Monkey, intelligence of, 245 ff. 

 Morgan, C. Lloyd, 37, 38, 34, 



121, 129, 177 

 Morgan, principle of, 34, 79, 130 

 Morgan, L. H., 207 

 Moore, A. R., 105, 107 

 Moore, B., 108, 109 

 Moths, sex discrimination in. 



Nepa, death feint in, 209, 210, 



212, 214 

 Nerve cells, behavior of, 188, 



189 

 Notonecta, phototaxis in, 61, 80 



Oltmanns, F,, 99 



Oppel, A., 185 



Orchestia, phototaxis in, 57, 80- 



82, 100, 101, ,102, 105 

 Orientation, 54, 56-61, 69 fif. 



Pain, relation to learning, 131- 



137, 140, 143 «F. 

 Paley, W., 30 

 Paramqecium, behavior of, 156, 



157 

 electrotaxis of, 107 

 Parental care, 34 ff. 

 Parker, G. H., 89, 103, 104, 228 

 Parmelee, M. F., 30 

 Pawlow, J. P., 150 

 Pauly, A., 28 

 Pearl, R, 112 

 Pearse, S. A., 229, 230 

 Pigeons, recognition of sex, 234, 



235 

 Pigment ceUs, behavior of, 182- 



184 

 Planarians, behavior of, 112, 



166-169 

 Plato, 12 

 Pleasure, relation to learning, 



131-137, 140, 143 ff. 

 Pliny, 12 

 Plutarch, 13 

 Porphyry, 12 

 Preyer, W., 214 

 Protozoa, behavior of, 32, 33, 



169 ff. 



Radl, E., 63 



Ranatra, death feigning of, 901, 



209-211, 213, 214 

 phototaxis in, 59-62, 80, 94, 95, 



102, 104, 108 



