Question: Which writer served as president of the Eugenics society, Havelock Ellis or Italo Calvino?

Context paragraphs:
The Crow Comes Last: The Crow Comes Last (Italian: "Ultimo viene il corvo" ) is a short story collection by Italo Calvino published in 1949.  It consists of thirty stories inspired by the novelist's own experiences fighting with the Communist "Garibaldi Brigades" in the Maritime Alps during the final phases of World War II.  The stories also include sharp observations on the panorama of postwar Italy.  Although written largely in the neorealist style, many scenes are infused with visionary, fable-like elements characteristic of Calvino's later fantasy period.

The Baron in the Trees: The Baron in the Trees (Italian: Il barone rampante ) is a 1957 Italian novel by Italo Calvino.  Described as a conte philosophique and a metaphor for independence, it tells the adventures of a boy who climbs up a tree to spend the rest of his life inhabiting an arboreal kingdom.  Calvino published a new version of the novel in 1959.

Six Memos for the Next Millennium: Six Memos for the Next Millennium (Italian: "Lezioni americane.  Sei proposte per il prossimo millennio" ) is a book based on a series of lectures written by Italo Calvino for the Charles Eliot Norton Lectures at Harvard, but never delivered as Calvino died before leaving Italy.  The lectures were originally written in Italian and translated by Patrick Creagh.  The lectures were to be given in the fall of 1985, and "Memos" was published in 1988.  The memos are lectures on the values of literature that Calvino felt were important for the coming millennium.  At the time of his death Calvino had finished all but the last lecture.

Havelock Ellis: Henry Havelock Ellis, known as Havelock Ellis (2 February 1859 – 8 July 1939), was an English physician, writer, progressive intellectual and social reformer who studied human sexuality.  He was co-author of the first medical textbook in English on homosexuality in 1897, and also published works on a variety of sexual practices and inclinations, as well as transgender psychology.  He is credited with introducing the notions of narcissism and autoeroticism, later adopted by psychoanalysis.  Like many intellectuals of his era, he supported eugenics and he served as president of the Eugenics Society.

Under the Jaguar Sun: Under the Jaguar Sun is a collection of three short stories by Italo Calvino.  The stories were to have been in a book entitled "I cinque sensi" ("The Five Senses").  Calvino died before writing the stories dedicated to vision and touch.  In the Italian edition (, 1986) the stories are ordered as follows: "Il nome, il naso"; "Sotto il sole giaguaro"; and "Un re in ascolto".  The titular story "Sotto il sole giaguaro" was originally published as "Sapore sapere" ("learning to taste") in the June 1982 edition of FMR, an Italian magazine.

Italo Calvino: Italo Calvino (] ; 15 October 1923 – 19 September 1985) was an Italian journalist and writer of short stories and novels.  His best known works include the "Our Ancestors" trilogy (1952–1959), the "Cosmicomics" collection of short stories (1965), and the novels "Invisible Cities" (1972) and "If on a winter's night a traveler" (1979).

The Path to the Nest of Spiders: The Path to the Nest of Spiders (Italian: Il sentiero dei nidi di ragno ) is a 1947 novel by the Italian writer Italo Calvino.  The narrative is a coming-of-age story, set against the backdrop of World War II.  It was Calvino's first novel.

Mr. Palomar: Mr. Palomar is a 1983 novel by the Italian writer Italo Calvino.  Its original Italian title is Palomar.  In an interview with Gregory Lucente, Calvino stated that he began writing "Mr. Palomar" in 1975, making it a predecessor to earlier published works such as "If on a winter's night a traveler".  "Mr. Palomar" was published in an English translation by William Weaver in 1985.

Margaret Pyke: Margaret Amy Pyke (1893–1966) was a British family planning activist and pioneer.  A founding member of the British National Birth Control Committee (NBCC), later known as the Family Planning Association (FPA), she succeeded Lady Gertrude Denman as chairman of that organization in 1954.  She was also a member of the British Eugenics Society.  Among other publications and articles, she wrote "Crypto Eugenics in The Empire" and "Family Planning: An Assessment" (extracted from "The Eugenics Review", Vol 55 No 2, July 1963, Publication Date: 1963).

Scuola Italiana Italo Calvino: The Scuola italiana "Italo Calvino" ("Italo Calvino Italian School"; Russian: Итальянская школа "Итало Кальвино" ) is the only Italian curriculum school in Russia.  It has two campuses in Moscow.

Supporting paragraphs: Havelock Ellis Italo Calvino
Answer: Havelock Ellis