Experimental morphology / by Charles Benedict Davenport.

  • Charles Benedict Davenport
Date:
1897-99
Catalogue details

Licence: Public Domain Mark

Credit: Experimental morphology / by Charles Benedict Davenport. Source: Wellcome Collection.

Provider: This material has been provided by the Francis A. Countway Library of Medicine, through the Medical Heritage Library. The original may be consulted at the Francis A. Countway Library of Medicine, Harvard Medical School.

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    16. The temperatures were not taken on the spot, Moselet says: The water from which the Algae were gathered was in the pools from which the Chroococcus was collected as far as I can now [i.e. many months after (V)] judge after testing water of successive temperatures with my finger, about 149°- 158 F. The water of the sulphur-springs, in the area splashed by which the Oscillatoria are found, is quite scalding to the hand, and probably between 176° to 194° F. 17. The reference reads: Dans celle [source chaude] de Saint Pierre, dont la temperature varie de 33 k 35 degrfe, les Physa acuta, Drap. sont en nombre si considerable qu'elles forment un veritable fond mouvant dans les canaux. These hot water molluscs, as experiment showed, were killed at {Jaout 43°, while Physa from ordinary sources die at once at 35°. They perished after a few hours at 5° or 6°. 18. Merely the note: On en [living mollusca] trouve aussi dans des eaux thermales: par exemple le turbo thermalis, espfece de paludiue sans doute, vit dans celles d'Abano, dont la temperature est de 40° R. 19. The statement is not critical: Their heat [hot springs] is too great for the hand to bear; the highest temperature is about 150°. In the hot water of these springs a green plant vegetated, which seemed to be a species of conferva growing in such situations: probably the fontenalis. But what is more remarkable, a bivalve testaceous animal adhered to the plant, and lived in such a high temperature too. 20. See note 5. 21. J'ai mesure plusieurs fois & en diverses saisons, la chaleur de ces eaux, & je I'ai toujours trouv6e k tr^s-peu pr6s la meme ; savoir, de 35 degr^s dans celle du soufre, & de 36^ ou 36.7 [R. from context] dans celle de St. Paul. Malgre la chaleur de ces eaux, on trouve des animaux vivans dans les bassins qui les regoivent; j'y ai reconnu des rotifdres, des anguilles & d'autre animaux des infusions. J'y ai meme d6couvert en 1790, deux nouvelles especes de tremelles dou6es d'un mouvement spontan^. 22. See note No. 14. 23. Many individuals collected by R. Blanchard dans les eaux de thermes du Hamman-Meskhoutine, prfes Guelma, dans les premiers jours d'avril; I'eau des thermes, au point de la r^colte, a une temperature de 45° et de 50.5° C. Les Cypris formaient une sorte de zone continue, de couleur chocolat, sur le bord de I'eau. 24. Found in a hot spring, temperature 157° F., attached to the rock by the long end at about an angle of 45° and continually moving. . . . The rocks were covered with them. 25. The note in Insect Life is abstracted from a longer article by Bruner in the newspaper called the Lincoln (Nebraska) Evening Call, for April 6, 1895. The article, through the kindness of Professor H. B. Ward of the Uni- versity of Nebraska, I have now before me. The larvae were sent to Professor Bruner by John C. Hamm, of Evanston, Wyoming, upon whom this stat' ment of the conditions of life of the organisms depends. The larvae were found in a cup-shaped depression in the top of a small isolated cone about 20 inches high, situated about a few feet from a large sulphur mound or dune, under which one could hear the rumbling of boiling water. Through apertures in the bottom the almost boiling water came up into the cup and ran over the edge of the pot.
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