172 BIBLIOGRAPHICAL NOTICES. 



amined the blood, having allowed it to rest for some hours, by the 

 aid of a power of 255 times ; and even twenty hours after extirpation, 

 the blood presented the two forms of crystallization of which I have spoken." 

 In order to avoid every kind of error, experiments were instituted, and 

 the results were always the same. Bull. Acad. Sc. and Belles Lettr^s, 

 Brux. 1839, Part I. p. 302 



Horkel read a paper at the meeting of the Academy of Sciences, Ber- 

 lin, 17th May, 1841, "On the Microscopic Investigations made by 

 Franciso Stelluti, in the beginning of the Seventeenth Century." This 

 communication is not yet published by the Academy. 



Apparatus for viewing the Circulation of the Blood in a very simple and 

 ready manner, adapted for Public Lectures. This apparatus is composed 

 of a small box enclosing a frog, the tongue of which is easily placed 

 for viewing the circulation of the blood, in the arteries, veins, capil- 

 laries, and even in the interior of the follicles. A compound lens is 

 adapted to this box, opposite to a hole which allows the direct light of 

 the sky, or that of a wax candle, according to circumstances, to fall 

 upon it. A low power is sufficient to see the circulation of the blood 

 in the interior of the tongue drawn out of the mouth of the animal, 

 and spread like a membrane. One of these apparatusses presented to 

 the Academy, was constructed by M. George Oberhauser ; the other 

 by M. Soleil, optician, after the pattern of M. Donne. Comptes Ren- 

 dus, 1841, p. 799. 



The employment of the Microscope in Medical Studies ; a Lecture intro- 

 ductory to a course of Histiology. By John Hughes Bennett, M. D., 

 Lecturer on Clinical Medicine, $c., Edinburgh. Edinburgh : Machlach- 

 lan & Co. London: S. Highley. Dublin: Fannin & Co. 1841. 

 8vo. Pamphlet, pp. 27. 



THE time has at length arrived, when it has been deemed expedient 

 to institute a Class in Edinburgh, for instructing the rising members of 

 the profession in the manipulation of the Microscope. This really be- 

 comes daily the more necessary, seeing that the scientific practitioners 

 throughout Europe, are resorting at length to this means, with such 

 acknowledged advantage and success. Dr. Bennett has passed some 

 considerable time with Continental Microscopic Observers, and is fully 

 competent to the difficult task he has engaged in, and in which we 

 heartily wish him every success. It will be a matter of surprise to us, if 

 the London Medical Schools do not appoint Professors for the same 

 purpose ; and this appears really the more looked for and demanded, 

 seeing that the many sources of error which creep into the experiments 

 made by the tyro, are too apt to cause him hastily to publish results, 

 and thus render more confusion in the science than is necessary, which 

 a few hints from one experienced in making such observations would 



