6. A. M. - To island.
First still hour since the afternoon of the 17th. March truly came in like a lamb and went out like a lion this year. Remarkably and continuously pleasant weather from the very first day till the 18th. Apparently an early spring, - buds and birds well advanced - then suddenly very severe cold and high winds cold enough to skim the river over in broad places at night, and commencing with the greatest and most destructive gale for many a year, felt far and wide; and it has never ceased to blow since till this morning. Vegetation is accordingly put back. The ground these last cold (thirteen) days has been about bare of snow, but frozen. Some had peas and potatoes in before it. First half of month very pleasant and mild spring weather, last half severe winter cold and high winds. The water at its highest, - not very high, - this month on the 17th. Ducks have been lurking in sheltered places not frozen. Robins feed along the edge of the river. At the Island I see and hear this morning the cackle of a pigeon woodpecker at the hollow poplar; had heard him tapping distinctly from my boat’s place, 1/4+ of a mile. Great flocks of tree sparrows and some F. hyemalis on the ground and trees on the Island Neck, making the air and bushes ring with their jingling. The former - some of them - say somewhat like this: a che che, ter twee twee, tweer tweer twa. It sounded like a new bird. The black ducks seem always to rise with that loud, hoarse croaking - quacking. The river early is partly filled with thin, floating, hardly cemented ice, occasionally turned on its edge by the wind and sparkling in the sun. If the sun had kept out of the way one day in the past fortnight, I think the river would have frozen to bear.
Read an interesting article on Étienne Geoffroy Saint-Hilaire, the friend and contemporary of Cuvier, though opposed to him in his philosophy. He believed species to be variable. In looking for anatomical resemblances he found that he could not safely be guided by function, form, structure, size, color, etc., but only by the relative position and mutual dependence of organs. Hence his Le Principe des Connexions and his maxim, “An organ is sooner destroyed than transposed,” - “Un organ est plutôt altéré, atrophié, anéanti, que transposé.” A principal formula of his was “Unity of Plan, Unity of Composition.” (In the Westminster Review, January, 18545.)