Angraecum Erratum

Well, now I feel silly. I got all excited because our Darwin's Orchid bloomed. But with further research, I discovered that our orchid is actually another species that is closely related to Darwin's Orchid. Ours is an Angraecum eburneum, and the orchid that prompted Darwin to make his famous moth prediction was an Angraecum sesquipedale. Sheesh!


Same genus, though, and both are native to Madagascar, and both have that elongated nectary spur.

I feel a lot better now that I've cleared that up.


Anyway, I still feel that an exceptionally long proboscis would be necessary for any moth to get it's way with our Angraecum eburneum.

Darwin's Orchid

I believe that there are times when the greatest fulfillment comes from letting tangents and coincidence guide one's attention. Well, coincident with the attention given to Darwin's two-hundredth birthday, my wife's specimen of Darwin's Orchid decided to bloom, and so it cried out for a snapshot today.

This genus is native to Madagascar. It has an elongated nectary - up to a foot long - extending from the back of the flower. Nectar is contained in the tip of the nectary. Darwin reasoned that there must be some species of moth with a proboscis long enough to reach the length of the nectary, but this hypothesis was ridiculed by others in his day.

The idea that such a long-tongued moth would have evolved is no longer considered ridiculous. Such a moth was indeed discovered years later.

This fascinating video from a Nature episode shows the moth in action with Darwin's Orchid:

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Dogs Shaping Human Evolution

The Bark just published a good article on Darwin and dogs by Mark Derr. It's an interesting read, and Derr's description of the often-misconstrued concept of natural selection is nice and clear.

It's pretty obvious in Darwin's thinking - and in the view of today's naturalists - that humans have influenced the evolution of the domestic dog. But an equally interesting hypothesis is Darwin's belief in the power of dogs to shape human evolution.

Derr quotes Darwin from The Descent of Man:

"The strongest and most vigorous men—those who could best defend and hunt for their families, who were provided with the best weapons and possessed the most property, such as a large number of dogs or other animals—would succeed in rearing a greater average number of offspring than the weaker and poorer members of the same tribes. There can, also, be no doubt that such men would generally be able to select the more attractive women."

I am curious to hear what my wife's thoughts will be.

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Darwin and Lincoln

This Thursday is the 200th birthday of both Charles Darwin and Abraham Lincoln. Everyone knows that both Darwin and Lincoln are figures of unmatched historical importance in our culture. The coincidence of their birth has been a point of interest for biographers who have noted a number of parallels in their lives, and on this subject, a brief article today in The Chicago Tribune is a nice read. More to the point of this post, a bit of web surfing reveals, not surprisingly, that both men were lovers of animals, and were lovers of dogs especially.

In Darwin's case, he showed an affinity for dogs and a talent for naturalistic observation in his youth. Although family status and tradition compelled the young Charles to begin studying for a career in medicine, he soon abandoned that course to the disappointment of his father. Darwin recalled his father once telling him that "You care for nothing but shooting, dogs, and rat-catching, and you will be a disgrace to yourself and all your family." Years after Darwin's legendary voyage aboard the HMS Beagle, the traits of domestic dogs figured prominently in Darwin's writings on evolution by natural selection (as notably evident from the first chapter of his landmark book, On The Origin of Species), and domestic dogs' behavioral traits provided much of the material from which Darwin developed his thoughts concerning The Expression of Emotion in Man and Animals.

Although Lincoln is obviously more celebrated for his statesmanship and heroism in matters of politics and human rights, he was certainly a good friend of animals. There is a story of how a young Lincoln waded barefoot through icy waters to rescue his dog during a family relocation trip. In another story recounted by historians, the newly elected president decided that his dog Fido would best be left in the care of family friends in Springfield, Illinois, instead of taking him to Washington. For the dog's comfort, the Lincoln family left their horsehair sofa for Fido to use in his new home. He is thought to have been the first dog of a president to be photographed (photo at top of post). After Lincoln was assassinated, Fido watched the funeral procession in Springfield. Tragically, within a year, Fido met with a violent death when he was stabbed by a drunk man who was enraged at the dog for having dirtied his clothing.

Biographers note that Darwin was an opponent of slavery, and that from his home in Britain he followed the news from the U.S. pertaining to Lincoln's presidency and the conflict between the states. Lincoln, conversely, appears not to have expressed much awareness of Darwin's work. Nevertheless, according to Lincoln's law partner, Lincoln read with interest some earlier writings from another naturalist who had theorized the evolution of species, though the mechanism of natural selection had not yet been well described in the literature before Darwin. We do not know whether the concept of evolution influenced Lincoln's politics, but historians might consider that question to be a bit narrow. What is more important is that the works of Darwin and Lincoln marked a change in the perception of man's place in nature. The views among naturalists and statesmen began to shift away from a position in which humans are "above" nature (and one race considered to be "above" another), and moved closer to a view of humans as part of nature along with other animals. The shift continued through the twentieth century, and is continuing today, and it is the legacy of two great lovers of dogs.

It is scarcely possible to doubt that the love of man has become instinctive in the dog.
- Charles Darwin

I care not for a man's religion whose dog and cat are not the better for it.
- Abraham Lincoln
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