“… cell of a tentacle, showing the various forms successively assumed by the aggregated masses of protoplasm.”

— Charles Darwin , book Insectivorous Plants

Detractors sometimes claim Darwin thought that the cell was an undifferentiated mass of protoplasm. Anyone reading the passage above will realize that Darwin thought no such thing.
Source: Insectivorous Plants (1875), chapter III: "Aggregation of the Protoplasm within the Cells of the Tentacles", page 40 http://darwin-online.org.uk/content/frameset?pageseq=55&itemID=F1217&viewtype=image

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Charles Darwin 161

British naturalist, author of "On the origin of species, by… 1809–1882

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“After a time the minute colourless particles which are imbedded in the flowing protoplasm are drawn towards and unite with the aggregated masses; so that the protoplasm on the walls being now rendered quite transparent is no longer visible, though some is still present, and still flows, as may be inferred from the occasional transport of particles in the cell-sap.”

Charles Darwin (1809–1882) British naturalist, author of "On the origin of species, by means of natural selection"

"The action of carbonate of ammonia on chlorophyll-bodies" Journal of the Linnean Society of London (Botany) (read 6 March 1882) volume 19, pages 262-284, at page 262 http://darwin-online.org.uk/content/frameset?pageseq=1&itemID=F1801&viewtype=text
Detractors sometimes claim Darwin thought that the cell was an undifferentiated mass of protoplasm. Anyone reading this paper will realize that Darwin thought no such thing.
Other letters, notebooks, journal articles, recollected statements

“Protoplasm is protean; any simple protoplasm can become any complex form of life under mutation and selection.”

Robert A. Heinlein book Beyond This Horizon

Source: Beyond This Horizon (1948; originally serialized in 1942), Chapter 13, “No more privacy than a guppy in an aquarium”, p. 126

“It would, however, be wrong to think of an electron as a bullet-like structure with tentacles sticking out from its surface. We can calculate the mass of the bullet, and also the mass of the tentacles. The two masses are found to be identical, each agreeing with the known mass of the electron. Thus we cannot take the electron to be bullet plus tentacles… The two pictures do not depict two different parts of the electron, but two different aspects of the electron. They are not additive but alternative; as one comes into play, the other must disappear.”

James Jeans (1877–1946) British mathematician and astronomer

Physics and Philosophy (1942)

“The fundamental division of forms of life on Earth is not that between plants and animals, as is commonly assumed, but between prokaryotes—organisms composed of cells with no nucleus, that is, bacteria—and eukaryotes—all other life forms.”

Lynn Margulis (1938–2011) American evolutionary biologist

Microcosmos: Four Billion Years of Evolution from Our Microbial Ancestors (1986)

“Greatness of individuality is inversely proportional to the mass of the social aggregate.”

Boris Sidis The Source and Aim of Human Progress

The Source and Aim of Human Progress (1919)

“It is patent on the face of history that the aggregates of men who form communities, like the aggregates of atoms that form living bodies, are subject to laws of progressive change – be it towards growth or towards decay.”

Robert Gascoyne-Cecil, 3rd Marquess of Salisbury (1830–1903) British politician

Quarterly Review, 156, 1883, p. 570
1880s

“I assume that cells, before their conversion into completely passive or "formed material," throw off minute granules or atoms, which circulate freely throughout the system, and when supplied with proper nutriment multiply by self-division, subsequently becoming developed into cells like those from which they were derived. These granules for the sake of distinctness may be called … gemmules. They are supposed to be transmitted from the parents to the offspring, and are generally developed in the generation which immediately succeeds, but are often transmitted in a dormant state during many generations and are then developed. Their development is supposed to depend on their union with other partially developed cells or gemmules which precede them in the regular course of growth. … Lastly, I assume that the gemmules in their dormant state have a mutual affinity for each other, leading to their aggregation either into buds or into the sexual elements. … These assumptions constitute the provisional hypothesis which I have called Pangenesis.”

Charles Darwin book The Variation of Animals and Plants under Domestication

volume II, chapter XXVII: "Provisional Hypothesis of Pangenesis", page 374 http://darwin-online.org.uk/content/frameset?pageseq=389&itemID=F877.2&viewtype=image
It is sometimes claimed that modern biologist are dogmatic "Darwinists" who uncritically accept all of Darwin's ideas. This is false: No one today accepts Darwin's hypothesis of gemmules and pangenesis.
The Variation of Animals and Plants under Domestication (1868)

“Science means simply the aggregate of all the recipes that are always successful. All the rest is literature.”

Paul Valéry (1871–1945) French poet, essayist, and philosopher

Moralités (1932)

“We can assume that in a relatively short time — perhaps within 100 million years — the one celled organism evolved into a colony of cells. With the further passage of time, groups of cells within those colonies assumed specialized functions of food-gathering, digestion, the structural features of an outer skin, and so on; thus began the stage of evolution leading to the complex, many-celled creatures which dominate life today.
The fossil record contains no trace of these preliminary stages in the development of many-celled organisms. The first clues to the existence of relatively advanced forms of life consist of a few barely discernible tracks, presumably made in the primeval slime by soft, wriggling wormlike animals. These are found in rocks about one billion years old. These meager remains are the earliest traces of many-celled animal life on the planet.”

Robert Jastrow (1925–2008) American astronomer

Red Giants and White Dwarfs : Man's Descent from the Stars (1971), p. 249.

“Organic life beneath the shoreless waves
Was born and nurs'd in ocean's pearly caves;
First forms minute, unseen by spheric glass,
Move on the mud, or pierce the watery mass;
These, as successive generations bloom,
New powers acquire and larger limbs assume;
Whence countless groups of vegetation spring,
And breathing realms of fin and feet and wing.”

Erasmus Darwin (1731–1802) English physician, botanist; member of the Lunar Society

The Temple of Nature (1802).

“… cell of a tentacle, showing the various forms successively assumed by the aggregated masses of protoplasm.”

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Charles Darwin 161

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