-in midst of range, have to struggle with other plants
--nectar of
--fleshy, on sea-shores
--climbing
--fresh-water, distribution of
--low in scale, widely distributed

Pleuronectidae, their structure

Plumage, laws of change in sexes of birds

Plums in the United States

Pointer dog, origin of
--habits of

Poison not affecting certain coloured animals

Poison, similar effect of, on animals and plants

Pollen of fir-trees
--transported by various means

Pollinia, their development

Polyzoa, their avicularia

Poole, Col., on striped hemionus

Potemogeton

Pouchet, on the colours of flat-fish

Prestwich, Mr., on English and French eocene formations

Proctotrupes

Proteolepas

Proteus

Psychology, future progress of

Pyrgoma, found in the chalk

Quagga, striped

Quatrefages, M., on hybrid moths

Quercus, variability of

Quince, grafts of

Rabbits, disposition of young

Races, domestic, characters of

Race-horses, Arab
--English

Radcliffe, Dr., the electrical organs of the torpedo

Ramond, on plants of Pyrenees

Ramsay, Prof., on subaerial denudation
--on thickness of the British formations
--on faults

Ramsay, Mr., on instincts of cuckoo

Ratio of increase

Rats, supplanting each other
--acclimatisation of
--blind, in cave

Rattle-snake

Reason and instinct

Recapitulation, general

Reciprocity of crosses

Record, geological, imperfect

Rengger, on flies destroying cattle

Reproduction, rate of

Resemblance, protective, of insects
--to parents in mongrels and hybrids

Reversion, law of inheritance
--in pigeons, to blue colour

Rhododendron, sterility of

Richard, Prof., on Aspicarpa

Richardson, Sir J., on structure of squirrels
--on fishes of the southern hemisphere

Robinia, grafts of

Rodents, blind

Rogers, Prof., Map of N. America

Rudimentary organs

Rudiments important for classification

Rutimeyer, on Indian cattle

Sageret, on grafts

Salamandra atra

Saliva used in nests

Salmons, males fighting, and hooked jaws of

Salt-water, how far injurious to seeds
--not destructive to land-shells

Salter, Mr., on early death of hybrid embryos

Salvin, Mr., on the beaks of ducks

Saurophagus sulphuratus

Schacht, Prof., on Phyllotaxy

Schiodte, on blind insects
--on flat-fish

Schlegel, on