Miscellanies. 205 



a fine fossil turtle and the jaw of a Saurian, and the Association of 

 American geologists saw with adiniration at Philadelphia in April, 

 1841, the beautiful chalk fossils of Mr. Nicollet, many of them superbly 

 adorned with their pearly coats — their nacre being almost untarnished, 

 after the lapse of ages. 



14. New Works in Science. — We find on our table a number of works 

 of much interest-, and all demanding more or less attention at our hands. 

 At present we must confine ourselves with giving the titles only of 

 some of the most important : 



Memoir of the Geological Survey of the State of Delaware, includ- 

 ing the Application of the Geological Observations to Agriculture. By 

 James C. Booth, A. M. Dover, Delaware, 1841. 8vo. pp. 188. 



Report of the British Association for the Advancement of Science 

 for 1841, (or Vol. 10,) 8vo. pp. 480. London, 1841. J. & E. Taylor. 



Bailey's Review of Berkley's Theory of Vision. London, 1842. 

 8vo. pp. 139. 



Scientific Memoirs, Vol. Ill, Part 10. April, 1842. 



Zoological Contributions, by S. S. Haldeman. No. 1, Feb. 1842, on 

 some American species of Hydrachnidse. 



Coup d'Oeil sur I'Etat Actuel de nos connaissances sur Electricite, 

 par M. A. de la Rive. From the Bibliotheque Universelle de Geneve. 



Papers on Practical Engineering, published by the Engineer Depart- 

 ment. Bitumine, its varieties and uses. Compiled from various sour- 

 ces by Lt. H. W. Halleck, under direction of Col. J. G. Totten. Wash- 

 ington, 1841. 8vo. pp. 206, with 3 plates. 



MISCELLANIES. 



FOREIGN AND DOMESTIC. 



1. Microscopic Fungus.— The fungus described by Prof. Bailey (in 

 this Journal, Vol. xlii, p. 195, Jan. 1842) as having been received from 

 England from Dr. Mantell, and discovered also by Prof. Bailey in the 

 neighborhood of West Point, has since been shown to be an Acarus, 

 the red fluid arising from the puncture of the enclosed animal when in 

 an embryotic state. In the spring of this year, the discoverer, Mr. 

 White, found to his great astonishment that each of the supposed fungi, 

 contained an Acarus of a red color, having six legs. At a late meeting 

 of the Microscopical Society of London, Mr. White produced speci- 

 mens of the animal in various states of development. The figures will 

 show four different stages of disclosure of this so-called fungus, as it ap- 

 peared to Dr. Mantell. The creature is more symmetrical than Miss 



